This is the Bluetooth device that projects a laser-generated keyboard onto any flat, opaque surface, providing an instant keyboard for any iPad, iPhone, or Android phone. The Class II laser device generates a 9 3/4"-wide x 4"-deep keyboard with 3/4" keys and recognizes keystrokes in three dimensions by an optical sensor that detects finger placement at different areas on the keyboard, distinguishing between a finger hovering above the space bar or a number key. An invisible infrared horizontal plane projected millimeters above the surface detects actual contact with "keys"-when the plane is interrupted by a finger, the projector assigns a keyboard character, passing it along to a paired device. Keeps pace with typing speeds up to 400 characters-per-minute. Its rechargeable battery provides up to 2 1/2 hours of operation from a 1 1/2-hour charge from AC using the included USB/AC adapter (or three hours via direct connection to a computer). 3" H x 1 1/2" W x 1 1/4" D. (2 1/2 oz.)