Product Description2 Transmitters + 12V 4CH Channel Relay RF Wireless Remote Control Switch Receiver 4CH Channel 443MHz Wireless RF Remote Control Relay Switch with 2 Receiver Features: - Long Range: The signal can pass through walls, floors and doors, control the receiver steadily from any place within a reliable distance. Max range is up to 98ft30m without obstacles. - 4CH for more control: Adjustable working mode, control equipment turnreverse, onoff. Switch Self-lock, Jog, Inter-lock. - Security Control: The learning code has high security level for its low repetition rate and re-learning mode, through which it can erase the old code and re-learn a new code when a remote control is lost, so that you are always in control of it. - Easy to use: Extremely easy to set up, learn, relearn and control. Stable and reliable performance, high receiving sensitivity. - Wide application: 4CH Channel 443MHz wireless RF remote control relay switch with 2 receivers WIDE range of APPLICATIONS from simple domestic remote control to autonomous control such as windows, entrance, garage doors, alarm systems, lifting equipment and so on. 4CH Channel 443MHz Wireless RF Remote Control Relay Switch with 2 Receivers Specification: Receiving Frequency: 443.92MHz Receiver Sensitivity: 105dB Max Load Current: 20A Remote Distance: 30M Operating Voltage: DC 12V 3m frequency 3m frequency x 3m frequency x 3m frequency: 3m 3m power Remote Control 1 x Relay