HP S01-pF0135t Slim Desktop – Intel® Core i3, 8GB RAM, 1TB HDD+256 GB SSD – 3UQ81AA#ABA – Refurbished
SKU: 3UQ81AA- Windows 10 Home 64
- 9th Generation Intel® Core™ i3-9100 processor
- Intel® UHD Graphics 630
- 8 GB memory; 1 TB HDD storage; 256 GB SSD storage
- DVD-Writer
- 180 days warranty
Samsung LS32BM703UNXZA 32-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – White
SKU: LS32BM703UNXZAEverything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 32″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 3000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i3, 16GB RAM, 512 GB PCIe® NVMe™ SSD, DVDRW, Windows 10 Pro – (4AL73UTR-d3) – Refurbished
SKU: 4AL73UTR-d3- Intel® Core™ i3-9100
- 16 GB DDR4-2666 SDRAM (2 x 8 GB), 512 GB PCIe® NVMe™ SSD
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4AL73UTR)
- 180 Days Warranty
Victus by HP 15L Gaming Desktop TG02-0014 PC – Intel Core i3-12100F – 8GB Memory – NVIDIA GeForce GTX 1650 – 512GB SSD – Mica Silver
SKU: 575M7AA- Windows 11 Home
- 12th Generation Intel® Core™ i3 processor
- NVIDIA® GeForce® GTX 1650 (4 GB GDDR6 dedicated)
- 512 GB Intel® PCIe® NVMe™ SSD
- 8 GB DDR4-3200 MHz RAM (1 x 8 GB)
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i5, 8GB RAM, 1TB HDD, DVDRW, Windows 10 Pro – (4BB93UTR-d5i) – Refurbished
SKU: 4BB93UTR-d5i- Intel® Core™ i5-8500T with Intel® UHD Graphics 630 (2.1 GHz base frequency, 4 cores)
- 8 GB DDR4-2666 SDRAM, 1 TB HDD/7200RPM
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4BB93UTR)
- 180 Days Warranty
LG 27UL500-W 27-inch 16:9 4K HDR FreeSync IPS Gaming Monitor
SKU: 27UL500-W- In-Plane Switching (IPS) Panel, HDMI | DisplayPort Inputs
- 3840 x 2160 4K UHD Resolution, 1000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178°/178° Viewing Angles
- 5 ms Response Time (GtG), 1.07 Billion Colors
Samsung LS43BM702UNXZA 43-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – Black
SKU: LS43BM702UNXZAEverything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 43″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 5000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP Factory Recertified Pavilion 570-P017C MiniTower PC (Z5M32AA) – Intel core i5, 8GB RAM, 1TB HDD, DVDRW, GigaBit Ethernet, Wireless+BlueTooth, 2GB AMD-Radeon Graphics, Windows 10
SKU: Z5M32AAR- Intel® Core i5-7400, 3.0GHz, Quad-Core Processor
- 8 GB DDR4-2133 SDRAM Memory
- Windows 10 Home
- 1 TB 7200RPM SATA Hard Drive, Ultra Slim-tray DVD Burner
- HP USB Wired Keyboard with volume control and Wired Optical Mouse
HP Pavilion TP01-3070 Desktop – Intel Core i7 – 512 GB SSD -12GB RAM – Windows 11 – Refurbished
SKU: 577D7AAR- 12th Gen Intel® Core i7-12700 (12-Core) Processor
- Wi-Fi 6 (2×2/160) Gig+ and Bluetooth® 5.2
- 12 GB memory; 512 GB SSD storage
- Microsoft® Windows 11 Home (64-bit)
- Refurbished – 180 Days Warranty
Lenovo ThinkPad T480s NoteBook – Intel Core i7 16GB Memory 256GB SSD 14.0″ FHD – Windows 10 Pro – Refurbished
SKU: KIT-LE-43829- Intel Core 8th Gen i7 8650U (1.90GHz)
- 16GB DDR4 Memory 256 GB PCIe SSD
- Intel UHD Graphics 620
- 14″ FHD 1920 x 1080
- Windows 10 Pro 64-bit
Memorex TravelDrive 64GB SuperSpeed USB 3.0 Flash Drive (Blue)
SKU: MEM64B- USB 3.0 SuperSpeed interface-backwards compatible with USB 2.0
- Protective cap keeps USB connector safefrom dust and damage
- Simple plug ‘n’ play technology requiresno additional software installation
- Available capacity: 8GB, 16GB, 32GB, 64GB
- System requirement: Microsoft Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000; Mac OS 9 and higher
HP Pavilion TP01-1227c Desktop – Intel® Core i3, 8GB RAM, 1TB HDD -9EF10AA-u – Refurbished
SKU: 9EF10AA-u- Windows 10 Home 64
- Intel® Core™ i3-10100 (3.6 GHz base frequency, up to 4.3 GHz)
- 8 GB memory; 1 TB HDD storage
- Integrated Intel® UHD Graphics 630
- 180 days warranty
HP S01-pF0135t Slim Desktop – Intel® Core i3, 8GB RAM, 1TB HDD+256 GB SSD – 3UQ81AA#ABA – Refurbished
- Windows 10 Home 64
- 9th Generation Intel® Core™ i3-9100 processor
- Intel® UHD Graphics 630
- 8 GB memory; 1 TB HDD storage; 256 GB SSD storage
- DVD-Writer
- 180 days warranty
Samsung LS32BM703UNXZA 32-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – White
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 32″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 3000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i3, 16GB RAM, 512 GB PCIe® NVMe™ SSD, DVDRW, Windows 10 Pro – (4AL73UTR-d3) – Refurbished
- Intel® Core™ i3-9100
- 16 GB DDR4-2666 SDRAM (2 x 8 GB), 512 GB PCIe® NVMe™ SSD
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4AL73UTR)
- 180 Days Warranty
Victus by HP 15L Gaming Desktop TG02-0014 PC – Intel Core i3-12100F – 8GB Memory – NVIDIA GeForce GTX 1650 – 512GB SSD – Mica Silver
- Windows 11 Home
- 12th Generation Intel® Core™ i3 processor
- NVIDIA® GeForce® GTX 1650 (4 GB GDDR6 dedicated)
- 512 GB Intel® PCIe® NVMe™ SSD
- 8 GB DDR4-3200 MHz RAM (1 x 8 GB)
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i5, 8GB RAM, 1TB HDD, DVDRW, Windows 10 Pro – (4BB93UTR-d5i) – Refurbished
- Intel® Core™ i5-8500T with Intel® UHD Graphics 630 (2.1 GHz base frequency, 4 cores)
- 8 GB DDR4-2666 SDRAM, 1 TB HDD/7200RPM
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4BB93UTR)
- 180 Days Warranty
LG 27UL500-W 27-inch 16:9 4K HDR FreeSync IPS Gaming Monitor
- In-Plane Switching (IPS) Panel, HDMI | DisplayPort Inputs
- 3840 x 2160 4K UHD Resolution, 1000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178°/178° Viewing Angles
- 5 ms Response Time (GtG), 1.07 Billion Colors
Samsung LS43BM702UNXZA 43-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – Black
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 43″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 5000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP Factory Recertified Pavilion 570-P017C MiniTower PC (Z5M32AA) – Intel core i5, 8GB RAM, 1TB HDD, DVDRW, GigaBit Ethernet, Wireless+BlueTooth, 2GB AMD-Radeon Graphics, Windows 10
- Intel® Core i5-7400, 3.0GHz, Quad-Core Processor
- 8 GB DDR4-2133 SDRAM Memory
- Windows 10 Home
- 1 TB 7200RPM SATA Hard Drive, Ultra Slim-tray DVD Burner
- HP USB Wired Keyboard with volume control and Wired Optical Mouse
HP Pavilion TP01-3070 Desktop – Intel Core i7 – 512 GB SSD -12GB RAM – Windows 11 – Refurbished
- 12th Gen Intel® Core i7-12700 (12-Core) Processor
- Wi-Fi 6 (2×2/160) Gig+ and Bluetooth® 5.2
- 12 GB memory; 512 GB SSD storage
- Microsoft® Windows 11 Home (64-bit)
- Refurbished – 180 Days Warranty
Lenovo ThinkPad T480s NoteBook – Intel Core i7 16GB Memory 256GB SSD 14.0″ FHD – Windows 10 Pro – Refurbished
- Intel Core 8th Gen i7 8650U (1.90GHz)
- 16GB DDR4 Memory 256 GB PCIe SSD
- Intel UHD Graphics 620
- 14″ FHD 1920 x 1080
- Windows 10 Pro 64-bit
Memorex TravelDrive 64GB SuperSpeed USB 3.0 Flash Drive (Blue)
- USB 3.0 SuperSpeed interface-backwards compatible with USB 2.0
- Protective cap keeps USB connector safefrom dust and damage
- Simple plug ‘n’ play technology requiresno additional software installation
- Available capacity: 8GB, 16GB, 32GB, 64GB
- System requirement: Microsoft Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000; Mac OS 9 and higher
HP Pavilion TP01-1227c Desktop – Intel® Core i3, 8GB RAM, 1TB HDD -9EF10AA-u – Refurbished
- Windows 10 Home 64
- Intel® Core™ i3-10100 (3.6 GHz base frequency, up to 4.3 GHz)
- 8 GB memory; 1 TB HDD storage
- Integrated Intel® UHD Graphics 630
- 180 days warranty
HP S01-pF0135t Slim Desktop – Intel® Core i3, 8GB RAM, 1TB HDD+256 GB SSD – 3UQ81AA#ABA – Refurbished
- Windows 10 Home 64
- 9th Generation Intel® Core™ i3-9100 processor
- Intel® UHD Graphics 630
- 8 GB memory; 1 TB HDD storage; 256 GB SSD storage
- DVD-Writer
- 180 days warranty
Samsung LS32BM703UNXZA 32-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – White
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 32″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 3000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i3, 16GB RAM, 512 GB PCIe® NVMe™ SSD, DVDRW, Windows 10 Pro – (4AL73UTR-d3) – Refurbished
- Intel® Core™ i3-9100
- 16 GB DDR4-2666 SDRAM (2 x 8 GB), 512 GB PCIe® NVMe™ SSD
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4AL73UTR)
- 180 Days Warranty
Victus by HP 15L Gaming Desktop TG02-0014 PC – Intel Core i3-12100F – 8GB Memory – NVIDIA GeForce GTX 1650 – 512GB SSD – Mica Silver
- Windows 11 Home
- 12th Generation Intel® Core™ i3 processor
- NVIDIA® GeForce® GTX 1650 (4 GB GDDR6 dedicated)
- 512 GB Intel® PCIe® NVMe™ SSD
- 8 GB DDR4-3200 MHz RAM (1 x 8 GB)
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i5, 8GB RAM, 1TB HDD, DVDRW, Windows 10 Pro – (4BB93UTR-d5i) – Refurbished
- Intel® Core™ i5-8500T with Intel® UHD Graphics 630 (2.1 GHz base frequency, 4 cores)
- 8 GB DDR4-2666 SDRAM, 1 TB HDD/7200RPM
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4BB93UTR)
- 180 Days Warranty
LG 27UL500-W 27-inch 16:9 4K HDR FreeSync IPS Gaming Monitor
- In-Plane Switching (IPS) Panel, HDMI | DisplayPort Inputs
- 3840 x 2160 4K UHD Resolution, 1000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178°/178° Viewing Angles
- 5 ms Response Time (GtG), 1.07 Billion Colors
Samsung LS43BM702UNXZA 43-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – Black
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 43″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 5000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP Factory Recertified Pavilion 570-P017C MiniTower PC (Z5M32AA) – Intel core i5, 8GB RAM, 1TB HDD, DVDRW, GigaBit Ethernet, Wireless+BlueTooth, 2GB AMD-Radeon Graphics, Windows 10
- Intel® Core i5-7400, 3.0GHz, Quad-Core Processor
- 8 GB DDR4-2133 SDRAM Memory
- Windows 10 Home
- 1 TB 7200RPM SATA Hard Drive, Ultra Slim-tray DVD Burner
- HP USB Wired Keyboard with volume control and Wired Optical Mouse
HP Pavilion TP01-3070 Desktop – Intel Core i7 – 512 GB SSD -12GB RAM – Windows 11 – Refurbished
- 12th Gen Intel® Core i7-12700 (12-Core) Processor
- Wi-Fi 6 (2×2/160) Gig+ and Bluetooth® 5.2
- 12 GB memory; 512 GB SSD storage
- Microsoft® Windows 11 Home (64-bit)
- Refurbished – 180 Days Warranty
Lenovo ThinkPad T480s NoteBook – Intel Core i7 16GB Memory 256GB SSD 14.0″ FHD – Windows 10 Pro – Refurbished
- Intel Core 8th Gen i7 8650U (1.90GHz)
- 16GB DDR4 Memory 256 GB PCIe SSD
- Intel UHD Graphics 620
- 14″ FHD 1920 x 1080
- Windows 10 Pro 64-bit
Memorex TravelDrive 64GB SuperSpeed USB 3.0 Flash Drive (Blue)
- USB 3.0 SuperSpeed interface-backwards compatible with USB 2.0
- Protective cap keeps USB connector safefrom dust and damage
- Simple plug ‘n’ play technology requiresno additional software installation
- Available capacity: 8GB, 16GB, 32GB, 64GB
- System requirement: Microsoft Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000; Mac OS 9 and higher
HP Pavilion TP01-1227c Desktop – Intel® Core i3, 8GB RAM, 1TB HDD -9EF10AA-u – Refurbished
- Windows 10 Home 64
- Intel® Core™ i3-10100 (3.6 GHz base frequency, up to 4.3 GHz)
- 8 GB memory; 1 TB HDD storage
- Integrated Intel® UHD Graphics 630
- 180 days warranty
HP S01-pF0135t Slim Desktop – Intel® Core i3, 8GB RAM, 1TB HDD+256 GB SSD – 3UQ81AA#ABA – Refurbished
- Windows 10 Home 64
- 9th Generation Intel® Core™ i3-9100 processor
- Intel® UHD Graphics 630
- 8 GB memory; 1 TB HDD storage; 256 GB SSD storage
- DVD-Writer
- 180 days warranty
Samsung LS32BM703UNXZA 32-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – White
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 32″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 3000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i3, 16GB RAM, 512 GB PCIe® NVMe™ SSD, DVDRW, Windows 10 Pro – (4AL73UTR-d3) – Refurbished
- Intel® Core™ i3-9100
- 16 GB DDR4-2666 SDRAM (2 x 8 GB), 512 GB PCIe® NVMe™ SSD
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4AL73UTR)
- 180 Days Warranty
Victus by HP 15L Gaming Desktop TG02-0014 PC – Intel Core i3-12100F – 8GB Memory – NVIDIA GeForce GTX 1650 – 512GB SSD – Mica Silver
- Windows 11 Home
- 12th Generation Intel® Core™ i3 processor
- NVIDIA® GeForce® GTX 1650 (4 GB GDDR6 dedicated)
- 512 GB Intel® PCIe® NVMe™ SSD
- 8 GB DDR4-3200 MHz RAM (1 x 8 GB)
HP EliteDesk 800 G4 Tower PC – Intel® Core™ i5, 8GB RAM, 1TB HDD, DVDRW, Windows 10 Pro – (4BB93UTR-d5i) – Refurbished
- Intel® Core™ i5-8500T with Intel® UHD Graphics 630 (2.1 GHz base frequency, 4 cores)
- 8 GB DDR4-2666 SDRAM, 1 TB HDD/7200RPM
- Windows 10 Pro-64 bit
- HP EliteDesk 800 G4 Tower PC (4BB93UTR)
- 180 Days Warranty
LG 27UL500-W 27-inch 16:9 4K HDR FreeSync IPS Gaming Monitor
- In-Plane Switching (IPS) Panel, HDMI | DisplayPort Inputs
- 3840 x 2160 4K UHD Resolution, 1000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178°/178° Viewing Angles
- 5 ms Response Time (GtG), 1.07 Billion Colors
Samsung LS43BM702UNXZA 43-inch M70B 4K UHD USB-C Smart Monitor with Streaming TV – Black
Everything you need is right in your screen. Watch, work and chat – all without connecting a separate PC – with Smart Monitor. Your favorite content, productivity and video call apps are built-in for a simpler and more stylish desk setup that’s a joy to use every time.
- 43″ Vertical Alignment (VA) Panel
- HDMI Input, 3840 x 2160 Resolution
- 5000:1 Static Contrast Ratio
- 300 cd/m² Brightness, 178° Viewing Angles
- 4 ms (GtG) Response Time
- 1.07 Billion Colors, 60 Hz Refresh Rate
- USB Hub, Wi-Fi 5 & Bluetooth 4.2
HP Factory Recertified Pavilion 570-P017C MiniTower PC (Z5M32AA) – Intel core i5, 8GB RAM, 1TB HDD, DVDRW, GigaBit Ethernet, Wireless+BlueTooth, 2GB AMD-Radeon Graphics, Windows 10
- Intel® Core i5-7400, 3.0GHz, Quad-Core Processor
- 8 GB DDR4-2133 SDRAM Memory
- Windows 10 Home
- 1 TB 7200RPM SATA Hard Drive, Ultra Slim-tray DVD Burner
- HP USB Wired Keyboard with volume control and Wired Optical Mouse
HP Pavilion TP01-3070 Desktop – Intel Core i7 – 512 GB SSD -12GB RAM – Windows 11 – Refurbished
- 12th Gen Intel® Core i7-12700 (12-Core) Processor
- Wi-Fi 6 (2×2/160) Gig+ and Bluetooth® 5.2
- 12 GB memory; 512 GB SSD storage
- Microsoft® Windows 11 Home (64-bit)
- Refurbished – 180 Days Warranty
Lenovo ThinkPad T480s NoteBook – Intel Core i7 16GB Memory 256GB SSD 14.0″ FHD – Windows 10 Pro – Refurbished
- Intel Core 8th Gen i7 8650U (1.90GHz)
- 16GB DDR4 Memory 256 GB PCIe SSD
- Intel UHD Graphics 620
- 14″ FHD 1920 x 1080
- Windows 10 Pro 64-bit
Memorex TravelDrive 64GB SuperSpeed USB 3.0 Flash Drive (Blue)
- USB 3.0 SuperSpeed interface-backwards compatible with USB 2.0
- Protective cap keeps USB connector safefrom dust and damage
- Simple plug ‘n’ play technology requiresno additional software installation
- Available capacity: 8GB, 16GB, 32GB, 64GB
- System requirement: Microsoft Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000; Mac OS 9 and higher
HP Pavilion TP01-1227c Desktop – Intel® Core i3, 8GB RAM, 1TB HDD -9EF10AA-u – Refurbished
- Windows 10 Home 64
- Intel® Core™ i3-10100 (3.6 GHz base frequency, up to 4.3 GHz)
- 8 GB memory; 1 TB HDD storage
- Integrated Intel® UHD Graphics 630
- 180 days warranty