Specifications: Distance: 50-150 meters. Very mini size: 5.5cm x 4.5cm x 1.0cm. One receiver can work with 400 codes. It doesn't interfere with other remotes and receivers. selector: With 8 dip switches, users can make different combinations for different remotes. Input Selector: This receiver can work with AC/DC 9V~30V. However, it's better to change the PIS according to the input. If the input is greater than 24V, shorten pin 2&3; shorten 1&2 if the input is less than 24V. Color: White + Black Material: ABS Programming a new remote: Select the correct brand for the remote to be programmed by moving dip switches UP or DOWN. For example, for 433.92Mhz Marantec remote controls, move Dip-switch 7 UP. Press the learn button. The LED will turn on. Press the button on the remote; the LED flashes 4 times. It means that the remote control was programmed successfully. Repeat step 2 for another button. The 2nd channel programming procedure is the same. Erase all data from the memory card: Press and hold either learn button. The LED will start flashing. Keep this button pressed until the LED turns off. All saved data in the memory card will be erased permanently and cannot be recovered. Compatible: All 433.92mhz fixed code remotes. Package Contents: 1 x Receiver 3 x Remote Control 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 to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.