Logitech Performance MK850 Unboxing, Review and Setup for 3 Computers - YouTube
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Logitech MK850 Performance Wireless Keyboard and Mouse Combo USB Wireless Bluetooth/RF USB Wireless Bluetooth/RF Optical - 1000 dpi - 8 Button - Scroll Wheel - AAA, AA - Compatible with Desktop Comput - Walmart.com
User manual Logitech MK850 Performance (English - 2 pages)
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Amazon.com: Logitech Signature K650 Comfort Full-Size Wireless Keyboard with Wrist Rest, BLE Bluetooth or Logi Bolt USB Receiver, Deep-Cushioned Keys, Numpad, Compatible with Most OS/PC/Window/Mac - Graphite : Electronics