Number of channels: 1/4 Battery: 12V 23A Installation: Wireless Wireless transmission distance: 50-150 (m). (Open space) Frequency: MAHS40 40.685MHz Red button. Compatible with MAHS40-01 only MAHS40 40.685MHz Purchase Tips: Check the frequency on the back of the remote control, it must be 40.685MHz. Check the color of the button, it is red. Check the model of the remote control, it is MAHS40-01 Programming Manual The transmitter and receiver understand each other, and the code must be set as follows. Slide the battery cover in the direction of the protruding part of the key ring to remove the battery cover. Set the dip switch up and down the same as the remote control or receiver you use. Note: Installation guide is not included, we strongly recommend professional installation. Please check as much as possible to make sure the item is what you need. Tips: Products may be constantly updated, due to different batches, the actual product may have slight differences or color differences, but it does not affect the use Color: Photo color Material: Plastic Package Contents: 1 x Garage Door Remote Control Only the above package content, other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual object. The measurement allowable error is +/- 1-3cm.