[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.

Wireless outdoor motion detector with ... Although the complete battery life is 5 years, it is possible to connect external power supply. Ajax MotionProtect Plus Fibra wired indoor motion detector ...

Its best feature is a phenomenal two-year battery life, powered by two ... to its predecessor, the Outdoor 3, the Outdoor 4 sports a slightly wider field of view (143 degrees versus 110), upgraded ...