Turning lightbulbs on from a smartphone is good fun, but what about controlling over our existing battery-powered gadgets and devices that aren’t equipped for it? Tethercell does exactly that. The AA battery-sized Tethercell holds a AAA-battery and works by replacing one of your device’s batteries and communicating via Bluetooth Smart to your tablet or smartphone, letting it cut power to the device with the press of a button within the free app. What we’ll use it for is another question, but we’re sure we’ll think of something.

Learn more at IndieGoGo – $35