Elsse (TM) Mini Wireless Keyboard with Mouse Touchpad for Computer, Projector, HTPC, etc Works with all devices that can work with USB Mouse - Simply plug in and play Perfect for PC, MAC, Projector, HTPC, etc Use 2 AAA battery - Battery not included Mini 9 button (T9) keyboard - press on one key and the letter starts to rotate. Keep Pressing on it until the desired letter appear Automatically goes to sleep after 2 minutes of no activities