Logitech MK345 Wireless Full-size Keyboard + 2.4GHz 1000DPI Wireless Optical Mouse Set with Nano Receiver(Black) 1. Waterproof splash design, liquid will flow out of the keyboard, no need to worry about accidental splash damage to your keyboard. 2. High-efficiency full-size keyboard, F1-F12 is fully enhanced, supports volume and media control, silent control, switches the next song, pauses the video. 3. Large palm rest, low-key and quiet keystrokes for a comfortable typing experience 4. The Nano receiver provides a reliable wireless connection. Store it in your mouse when not in use. 5. The mouse is designed with a hand-corrugated handle for comfortable grip. 6. Optical sensor for comfortable operation, precise tracking and convenient text selection. 7. 2.4GHz wireless connection technology, no delay, no loss of signal. Parameter: 1. Keyboard size: 187mm high, 441mm wide, 21mm thick. 2. Mouse size: height 68mm, width 106mm, thickness 38mm. 3. Keyboard: 2 AAA batteries (not included). 4. Mouse: 1 AA battery (not included). 5. Resolution: 1000dpi. 6. Working mode: Optical mouse. 7. Number of buttons: 2 for the mouse and 104 for the keyboard. 8. Receiver type: Nano. 9. Is there a power switch: Yes.