Here are keyboard solutions you may have a try. 1. Have silver/aluminum foil rolled and placed in front of the positive ends of the battery between the battery and the terminal on the keyboard. Wait for a while, try the keyboard again. 2. If it doesn't help, pls try the instructions below. Step 01, Take off the Nano. Step 02, Press "ESC" and "=" ( about 3 seconds ? Step 03, put the Nano in, try the unit again. [Mouse]6D Multi-function Keys:6 buttons with scroll wheel (Two Side-Buttons, One DPI Switch)£¬High-end optical engine, Super Laser, Fast and Precise Positioning. 1000/1600DPI Customize DPI Switch. 10 Combination by Multimedia Keys:Apply to more areas, game playing fired. Listening to music is so easy and quick keys entertainment easier. 19 keys with no breakthrough,USB wireless receiver is in the back cover of the mouse,For connect the the Wireless Keyboard and Wireless Mouse.