Source: http://gizmodo.com/with-a-2-year-battery-you-can-put-this-wireless-motion-1676116530
The best way to protect your home from intruders is a network of motion sensors monitoring every square inch of your abode. D-Link's new Z-Wave Motion Sensor not only makes that possible, it makes it impossibly easy, since the wireless sensor features a built-in battery that's good for up to two years of continuous operation. So you can mount it in obscure and hard-to-reach places, and not have to worry about running wires or constantly changing batteries.