... 4 material: silica gel and aluminum Transmitter: Code: rolling code:Frequency:433.92MhzButton: 1-button,2-button,3-button,4-buttonColor ... .We serve programmable wireless remote,transmitter,receiver,tubular motor control panel,motor group controller,sliding door control board,garage door control ... other accessories. gate remote with slip cover and 433.92Mhz frequency