Easy installation and , rolling code. Product parameters Working voltage: 3v; Working current: less than equal 12mA; Launch distance: 100 meters (open); Name: Compatible with 891LM 971LM 81LM 371LM universal remote controls How to operate The same as the remote control, it needs to be paired with the host Colour:black Material:Metal+ABS Package Contents: 1 x Garage Door Opener Only the above package content, other products are not included. Note: Light 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.