Features: 2 channel relays which can make the equipment turn or reverse, on/off and so on come true. Each wireless remote control has 2 programmable function keys. The output way/working way can be changed as you like. Widely used in auto door, window, lifting equipment, entrance access, up and down controller, alarm system industrial control and security etc. Includes door garage opener remote control switch 2 pieces, transmitter and receiver set. Specifications: Remote Control: Item Condition: 100% Brand New Material: ABS Color: As Pictures Show Dimension: 5.0*3.0*1.3cm/2.0*1.2*0.5in (Approx.) Remote control power supply: 2*3V CR2016 button battery(Not included) Working frequency: 433MHZ Key: 2 Keys Transfers distance: 50m-100m (in the open space) Receiver: Working voltage: DC 12V Static current: ≤ 8.5mA Working frequency: 433 MHz Receiving sensibility: > 97 dBm Modulation mode: ASK Encode mode: Learning code (1527) Decoding mode: MCU software decoding Wiring type: Fixed terminal Switch output: Normally open & Normally closed Working temperature: -30℃~ 80℃ Package Weight: 136g/4.8oz Package List: 1 * Receiver with Shell 2 * Remote Controllers . Note: Because the manufacturer uses the same board for 12V and 220V, the voltage distinction needs to see how many capacitor plug-ins are on the board. One capacitor is 12V, and three capacitors are 220V.