2 Transmitter+ 12V 4CH Channel Relay RF Wireless Remote Control Switch Receiver Relay Rf Wireless Remote Control Switch 2 Transmitter + Receiver Features: - Long Range : Signal can pass through walls, floors and doors, steadily control receiver from any place within a reliable distance. Max range is up to 98ft/30m with no obstacle. - 4CH for More Control : Adjustable working way, control equipment turn/reverse, on/off. Switch Self-lock, Jog, Inter-lock. - Security Control : Learning code has high-level security for its low repetitive rate and re-learn mode, by which it can delete the old code and re-learn a new code when a remote control get lost, so you are always in control of it. - Easy to Use : Extremely easy to setup, learn, relearn and control. Stable and reliable performance, high receive sensitivity. - Wide Application : Relay Rf Wireless Remote Control Switch 2 Transmitter + Receiver WIDE range of APPLICATIONS from simple domestic remote control to autonomous control such as, window, entrance, Garage Doors, alarm system, lifting equipment and so on. Relay Rf Wireless Remote Control Switch 2 Transmitter + Receiver Specification: Receiving frequency : 443.92MHz Receiver sensitivity : 105dB Max load current : 20A Remote Distance : 30M Operating Voltage : DC 12V Frequency : 315mhz Operating Current : 13 mAh Package Includes: 2 x Remote Control 1 x RelayProducts from He Wei 's store