... to 40db.b)With the help of advanced synchronous belt and perfect design of power supply circuit , the door moves very stably.c ... OneControl System1Motor1set24V,55W,bruthless2Control unit1pcMicrochips, Toshiba MCU3Remote controller1set1 receiver,2 transmitter , 4Radar2pcsBEA,24.125HzTwoMechanism1Track1pc3mm thickness2Carriage4 setsGalvanized and adjustable3Tooth belt1pcfiberglass tensile,nylon ...