A team in France developed a prototype bracelet called the Cicret bracelet that allows the wearer's arm to function as a smartphone screen. By twisting their wrist, the bracelet projects a touchscreen interface onto the arm using a pico projector. Sensors in the bracelet detect finger touches on the arm and send the input to an app connected via Bluetooth or WiFi to control a smartphone without needing to physically hold it. The concept aims to overcome issues with physically carrying smartphones like accidentally dropping or forgetting them.