The sticker is made of two stacked layers of electrodes that are arranged in a grid. The current iteration of the material still needs to be hardwired to a touch-controller microchip, which is then connected to a small Raspberry Pi Zero. So far, the researchers have been able to create four different interfaces with the tech, including a bracelet that can manage an LED lamp, a behind-the-ear sticker that controls a music player, a forearm sticker that can send text messages and a palm sticker that can let you take a phone call. While the technology is in the early stages, it's not hard to imagine a future where you don't need hardware devices like headphones and smart watches to interact with your smart gadgets.