(1) Most QWERTY computer keyboards use a single rubber-like membrane underneath the keys that makes contact with a circuit board when the key is fully depressed. Also called a "dome switch ...

By sensing which circuit was modified, the keyboard can tell which key was pressed and transmit that information to your computer, translating finger motions into letters, numbers, and symbols.

Tap is a Bluetooth keyboard you wear on your hand. You can pair Tap with your phone, tablet, or computer like any Bluetooth keyboard, but you type with gestures.

It feels a lot like InFocus’s $99 Kangaroo PC, which similarly stuffs an entire Windows computer into a pocket-able form factor, but trading out the Kangaroo’s battery for a floppy keyboard.