
Tap is a hand-worn, futuristic replacement for a keyboard, mouse, and game controller that connects to iPhones and iPads, Macs, and PCs, and other devices using Bluetooth.
Tap fits over your fingers and can be used on any surface, meaning you can do away with a traditional desk, but mastering its use takes some intensive practice that may turn some people away.

Design
Tap is meant to be worn on the left or right hand, with an adjustable ring for each finger. There's a flexible rubber material for the front of each finger (plus a sensor for detecting movement), with each finger connected via a soft woven cord.
The thumb piece of the Tap is the largest of the bunch and houses most of the electronics, while the adjustable rings for the other fingers are smaller. Tap is meant to fit snugly at the bottom of your fingers, where you would wear a ring. Side note: You're probably going to have to take off rings to wear the Tap because of the way that it fits.

The woven cord that is between each ring can be pulled tighter or looser, so it's able to fit a range of fingers. Tap comes in small and large sizes, and will fit many hand sizes.

I have small hands and with the small-sized tap, I was able to adjust the Tap to fit well on all of my fingers. Given that it fits my small hand, it should fit older children and adults alike.
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Article Link: Review: Tap is a Futuristic Hand-Worn Keyboard That Lets You Type With Gestures