[Brad] was asked by his Sister to design a motion-based alarm ... active at night and can be battery-powered. What he came up with is a light-sensitive motion sensor that uses very little power.

A quartet of Aootek Solar Motion Sensor Lights is on sale for just ... 270-degree area. They’re powered by a rechargeable lithium-ion battery that’s connected to a nearly 12-square-inch ...

Solar lights harness energy from the sun and store it in an internal battery to power the lights when needed ... screws and hooks in your wall. Motion sensor lights are ideal for increased ...