Skinput technology turns the human body into a touchscreen input interface by using sensors to detect vibrations on the skin caused by taps and turns. It consists of an armband with sensors, a Bluetooth connection, and a small projector. When the user taps their skin, sensors detect the acoustic waves and can identify different locations tapped. The projector then displays a virtual keyboard or buttons onto the arm. The system works well but accuracy decreases for obese users or many input locations. Future applications could include texting by tapping on projected keyboards or controlling devices while walking.