Infrared sensor set: Short the sensor power button to turn on, long the sensor power button to turn off. The receiver is plugged in for use. Split Sensor Set: Short the door magnetic sensor button to turn on, long the split sensor button to turn off. The receiver is plugged in. Learning code pairing and clearing: Learning code: After the receiver is switched on, long the volume button for 3-4 seconds, the indicator light is long , release the button to enter the learning state. Trigger the inductive transmitter or any key of the remote control to pair with the host. Clear the code: under the state of power on, long the volume button for 10 seconds, (the third second when the light starts to light up, and then continue to for 7 seconds) until the indication blinks three times. It means the code is cleared successfully. Attention: Please try to use high quality alkaline batteries, avoid using ordinary carbon zinc batteries which have short battery life and are prone to leakage of . Please avoid installing the product in the place where it is directly drenched by rain or exposed to sunlight for a long time. The actual remote control distance vary depending on the use of environmental factors. Split Sensor uses DC 4.5V 3xAAA battery.(Batteries not included) Infrared sensor uses 3xAA battery or Micro-USB charging cable. (Batteries not included) Color:White Material:ABS Package Contents: 1 * Sensor 1 * Main Unit 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.