Specifications: 1) Distance: 50-150 meters. 2) Very mini size: 5.5cm x 4.5cm x 1.0cm. 3) One receiver can work with 400 codes. 4) It does not interfere with other remotes and receivers. 5) Selector: With 8 dip switches, users can make different combinations for different remotes. Power Input Selector: This receiver can work at 9V~30V. However, it's better to change the PIS according to the power input. If the input is greater than 24V, short pin 2; short 1&2 if input is less than 24V. Color: white + black Material: ABS Programming a remote: 1) Select the correct frequency for the remote to be programmed by moving dip switches UP or DOWN. For example, for 433.92MHz remote controls, move Dip-switch 7 UP. 2) Press the learn button. The LED turns on. 3) Press the button on the remote. The LED flashes 4 times. This indicates the remote control was programmed successfully. 4) Repeat for another button. 5) The 2nd channel programming procedure is the same. Erase all data from the memory: Press and hold either learn button. The LED starts flashing. Keep the button pressed until the LED turns off. All saved data in the memory will be erased permanently and cannot be recovered. Compatible with: All 433.92MHz fixed code remotes. Package Contents: 1 x Receiver 3 x Remote Control Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the actual item. Measurement allowance is +/- 1-3cm.