1. 1-button,2-button,3-button,4-button 2 color: black and white 3 code: rolling code 4 material: silica gel and aluminum Transmitter: Code: ... the automatic door control systems.We serve programmable wireless remote,transmitter,receiver,tubular motor control panel,motor group controller, ... ,rolling shutter controller board and other accessories. gate remote with slip cover and 433.92Mhz frequency