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 don't interference other remotes and receivers. 5) Brand selector: With 8 dip switches user can make different combination for different remote brands. Power Input Selector: This receiver can work at AC/DC 9V~30V. However, it's better to change the PIS according to the power input. If the input is great than 24V, shorten pin 2&3; shorten 1&2 if input less than 24V. Color: white + black Material: ABS Programming a remote 1) Select the correct brand for remote to be programmed by moving dip switches UP or DOWN. For example 433,92Mhz Marantec remote controls, just move Dip-switch 7 UP. 2) Press the learn button. The will LED turn on. 3) Press the button on the remote, the LED flashes 4 times. It means that remote control was programmed successfully. 4) Repeat step 2 for another button. 5)The 2-nd channel programming procedure is the same. Erase all data from the memory card: Press and hold either learn button. The LED will start flash. Keep this button pressed, until the LED will turn off. All saved data in the memory card will be erased permanently and can not be recovered Compatible brands: All 433.92mhz fixed code remotes. Package Contents: 4 x Receiver 12 x Remote Control