SECIFICATIONS: 1. Power supply: 12v-24v DC 2. Frequency: 433.92Mhz 3. Codes: can work with any fixed/learning/rolling codes 4. 2 channel 5. Working temperature :-40- and 80 6.Built in Aerial antenna : Reception range 10-50m Momentary working model Press the Transmitter button 1, the receiver relay 1th is ON, release button 1; the receiver relay 1th is OFF. Press, the door opens, release, and the door closes. Store 50-60 codes PROGRAMMING: 1.Learning transmitters codes: Press learn 1 or learn 2 for 1 second, the learn_led light, then, press the button which you choose on the transmitter till the learn_led flash and go out, the transmitters code has been stored. Repeat the above steps for other transmitters. 2.Erasing transmitters codes: Press learn 1 or learn2 and hold on to make the learn_led light till go out, all codes of transmitters which had been stored are erased. Circuit diagram ANT - Receiver Antenna CH1 - Relay Output 1 CH2 - Relay Output 2 Vand - Voltage and GND - Ground Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.