About Receiver: Model No.: AK-C211008 1. Working voltage: AC100-240V / DC12-36V 2. Quiescent condition: Less than 6mA. 3. Working temperature: -40 Degree +80 Degree. 4. Receiver sensitivity: more than -105dBm. 5. Working frequency: 433mhz. 6. Max load current: 10A About Learning and clearing Method: Learning: Press learning button, the indicator flashes and OFF, loosen finger, press any button of the remote mitter, indicator flashes three times, meaning learning succeeds.(how many times press the learning button according to the working way you need) Clearning: Hold press learning button about 8 seconds,indicator light flashes several times and off, then press remote ,Relay did not Respond ,it means clearning code successful. Color: white+orange+black Material: PC+ABS About Working way: Working way changed by Learning button Momentary: Press the Learning Button 1 times. Relay: Press and hold -On; Release -Off. Toggle: Press the Learning Button 2 times. Relay: Press -On; Press same button again -Off· Latched: Press the Learning Button 3 times. Relay: Press -On; Press other button -Off. 2channel Momentary +2channel Latched: Press the Learning Button 4 times. 2channel Momentary +2channel Toggle: Press the Learning Button 5 times. 2channel Toggle +2channel Latched: Press the Learning Button 6 times. About mitter: 1.Buttons: 4 Buttons 2.Working Voltage:DC9V battery (battery not included) 3.Operating frequency:433MHz 4.Remote Distance: 200-2000M 5.Operating Current: 13 mAh Due to different product batches, the appearance may be different, which does not affect use. Package Contents: 1 x Wireless 4CH Remote controller Receiver 1 x Remote Control mitter 1 x Suckers Antenna 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.