Overview: The elite of the advanced computer manufacturing technology, apply the function of automatic light sensitivity. The excellent function, easy usage, energy saving, & high sensitivity make it meet the need of marker more & closer to consumers' lives. It's suitable for the dwelling houses, shop, offices, factories & so on. It not only brings you convenience, but also give you the unexpected happiness & safety. Powered by 3 AA1.5V batteries Light control distance is 3-7 meters. Specification: Weight Approx:88.4g Size Approx:8.2 x 4.5 x 8.2