About Receiver:1. Working voltage: DC12V-36V;2. Quiescent condition: Less than 6mA; 3. Working temperature: -40 Degree +80 Degree; 4. Receiver sensitivity: more than -105dBm; 5. Working frequency: 433mhz; 6. Output voltage: DC and AC is optional; 7. Max load current: 10A About Learning and clearing Method:Learning: learning button, the indicator flashes and OFF, loosen finger, any button of the remote transmitter, indicator flashes three times, meaning learning succeeds.(how many times the learning button according to the working way you need); Clearning: Hold learning button about 8 seconds,indicator light flashes several times and off, then remote ,Relay not Respond ,it means clearning code successful. About Working way: Working way changed by Learning button Momentary: the Learning Button 1 times. Relay: and hold - On; Release - Off. Toggle: the Learning Button 2 times. Relay: - On; same button again - Off· Latched: the Learning Button 3 times. Relay: - On; other button - Off. 2channel Momentary +2channel Latched: the Learning Button 4 times. 2channel Momentary +2channel Toggle: the Learning Button 5 times. 2channel Toggle +2channel Latched: the Learning Button 6 times. About Transmitter: 1.Buttons: 4 Buttons 2.Working Voltage:DC3V battery AA*2 not included 3.Operating frequency :433MHz 4.Remote Distance: 200-1000M 5.Operating Current: 13 mAh 6.Encode: EV1527 code Due to different product batches, the appearance , which does not affect the use Colour:As Shown Material:plastic Package Contents: 1 x controller 1 x remote controller(Without 2 x AA batteries) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.