Versatile device. This motion detector has a solar panel and an integrated lithium battery. It must be installed so that there is a possibility to collect enough solar energy during the day. In darkness, the motion detector is activated and as soon as it detects a movement, the 20 green LEDs of the device start to glow. Dimensions: 16.5 x 8.9 x 8.3 cm. Weight: 270 g.