Harwoodr, It uses a 9V battery that lasts for about 6 months. It uses 868MHz ISM band and does not interfere with anything in your house. Outside range is about

Harwoodr, It uses a 9V battery that lasts for about 6 months. It uses 868MHz ISM band and does not interfere with anything in your house. Outside range is about 50 yard/meters, inside a couple of rooms.