Fin is a wearable ring device that allows the user to control multiple digital devices through gestures of the hand and fingers. It was developed by Rohildev N and his company RHL Vision Technologies. When worn on the thumb, Fin uses sensors and Bluetooth to turn the palm and fingers into a touch interface. Users can swipe and tap with their thumb to dial calls, send texts, control media playback and more on connected smartphones, smart TVs, cars and other devices in a hands-free manner.