2 Transmitters + 12V 4-Channel Relay RF Wireless Remote Control Switch Receiver Long Range: Signal can pass through walls, floors, and doors, steadily controlling the receiver from any location within a reliable distance. Max range is up to 98ft/30m without obstacles. 4CH for More Control: Adjustable working mode, control equipment rotation/reverse, on/off. Switch Self-lock, Jog, Inter-lock. Security Control: Learning code has a high-security level due to its low repetition rate and re-learning mode, which allows it to erase the old code and learn a new code when a remote control is lost, ensuring you always have control. Easy to Use: Extremely easy to set up, learn, re-learn, and control. Stable and reliable performance, high receiving sensitivity. Wide Application: Relay Rf Wireless Remote Control Switch 2 Transmitters + Receiver has a WIDE range of APPLICATIONS from simple domestic remote control to autonomous control such as windows, entrances, garage doors, alarm systems, lifting equipment, and so on. Relay RF Wireless Remote Control Switch 2 Transmitters + Receiver Specification: Receiving Frequency: 443.92 MHz Receiver Sensitivity: 105dB Max Load Current: 20A Remote Distance: 30M Operating Voltage: DC 12V Frequency: 315 MHz Operating Current: 13 MAH Package Includes: 2 x Remote Control 1 x Relay