Change the way you interact with the world using the Tap Wearable Keyboard. The beauty of this keyboard lies in the fact that it can turn anything you can touch into a typing surface. In other words, Tap transforms the tactile world into a keyboard.
You just need to create your Tap account, download the Tap apps and start Tapping. The Tap Strap has a series of embedded sensors which monitor mechanical information of the hand and fingers.
This information is then 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.
Tap is compatible with any Bluetooth device that supports the HID Keyboard Standard. This includes iOS and Android phones and tablets, Window and Mac computers, and most Smart TVs.
More info here