The itouchpad diamond keyboard has a built in mouse trackpad with right & left click capabilities resulting in no need for an external mouse. You can walk around the room when giving a presentation & navigate the page effortlessly, or if you are teaching in class you no longer have to be stood next to the computer at all times. The re-chargeable nature of the keyboard means that when you arent using the keyboard, just connect it to the computer via USB (Universal Serial Bus) & it will have plenty of battery for when you need to next use it. There is also an On/ Off switch which can save power when you dont need to use it. The keyboard is plug n play enabled therefore there are no drivers which need to be installed. Key count: 89 Construction: Soft-Touch-Membrane technology Battery type: 2 — AAA 1.5 V (included) Plug n play Re-chargeable Full functionality of a full-size layout keyboard due to built in numeric keypad & 12 function keys Tilt feet for adjustment of the tilt angle for an absolute skid-proof & ergonomic operation Blue LED indicating pairing, transmitting & low battery Power On/ Off switch to save battery Optimal for Digital Living Rooms (HTPC) as well as for training, conference & presentation rooms etc. Dimensions: 307.2mm x 24.8mm x 203.1 mm Weight: 570g