Number of channels: 1/4<br> Battery: 12V 23A<br> Installation: wireless<br> Wireless transmission distance: 50-150 (m). (open space)<br> Frequency: MAHS40 40.685MHz red buttons.<br> Only Compatible With for MAHS40 40.685MHz for MAHS40-01<br> Purchase Tips:<br> Check the frequency on the back of the remote control, it must be 40.685MHz.<br> Check the colour of the button, which is red.<br> Check the model number of the remote control, which is MAHS40-01<br> Programming Manual<br> The transmitter and receiver "understand" each other, the code must be set as follows.<br> Remove the battery cover by sliding it in the direction of the keyring tab.<br> Set the dip switch up/down same as your used remote control or the receiver.<br> Note:<br> Installation guide not included, we strongly recommend you professional installation.<br> Please check as much as possible to make sure the item is what you need.<br> Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use<br> Colour:Photo Color<br> Material:plastic<br> Package Contents:<br> 1 x Garage Door Remote Control<br> Only the above package content, other products are not included.<br> 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.