The new technology can be worn as an adjustable sleeve on the user鈥檚 arm or leg or sewn into everything from clothing and backpack straps to dog leashes, allowing 鈥渆yes-free鈥 control of a tablet, phone or media player that doesn鈥檛 require any precise button touching. The new prototype joins popular wearable high-tech devices ranging from smart watches and fitness bands to headsets and smart gloves.