... 1. 100m control distance 2. Widely used for appliance 3. press on, press again off. 4 ... ) 2 x Transmitter: C-21 x User manualFeature:Wireless control, easy to installControl Lights, Motors, Fans, electrically ... from any place within a reliable distance; the wireless signal can pass through walls, floors and doors. ... 23A -12V battery (included, can be used for 12 months)Usage:Press button 1: Turn on relay ...