Amazon.com: Wireless Keyboard and Mouse Combo, Full-Sized 2.4GHz Wireless Keyboard with Comfortable Palm Rest and Optical Wireless Mouse for Windows, Mac OS PC/Desktops/Computer/Laptops : Electronics
What's the fourth light for? There are 4 indicator lights, and I just don't know what the fourth could be. It turns on randomly and I have no clue what triggers it. (