Tap Strap has a series of embedded sensors which monitor mechanical information of the hand and fingers. This information is processed by an MCU in the Strap, which decodes the raw data into finger tap combinations and transmits the resulting characters or commands via a Bluetooth radio.
The Tap Strap is a Bluetooth device that turns any surface — or even the air — into a one-hand keyboard. You place your fingers through the holes in a flexible strap, and the strap senses your finger motions. As with any one-handed keyboarding system, you must learn a new system.
The cool thing about Tap Strap is that you can type practically anywhere with it. With embedded sensors that monitor the mechanical information of your hands and fingers and transmit it to your phone via Bluetooth, Tap Strap can recognise what you’re typing.
Tap Strap is compatible with pretty much any Bluetooth device (iPhone, Pad, Pod, or an Android phone or tablet).
http://www.tapwithus.com/