Technical Parameters Power Input: 7-32V, Users should not exceed these power inputs Channel:2CH. Frequency:433MHz. Memory Capacity:200 remotes.<br><br>Learn button and LED In the Multi receiver there are 2 channels. Each channel has an learn button S1, S2. The LED L1 corresponds to S1 and the LED L2 corresponds to S2. Operation How to enter remote and erase all remotes. Coding the remote: a. Select the dip switch for the and model. b. the learn button S1 or S2, the LED turn on. the button on the remote, the LED flashes 4 times. The button has been learnt successfully. c. Repeat for any other button. Please note S1 is Channel 1 and S2 is Channel 2. Erase all data in memory card: Pressing and holding either S1 or S2 learn button, the LED start to flash. Keep holding this button until the LED turns off. All data in the memory card be erased permanently. WARNING: Be careful when erasing all data in the memory card. The data be erased permanently and cannot be recovered. Color: Black Material: plastic<br><br>Package Contents: 1 x Garage receiver<br><br>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.