... collision mechanism: need to buy extrally5) This boom barrier gate provides optional housing color as yellow (default),orange, white ... decelerating torque motor3) Controller: Intel 80C51 MCU, 40 MHz,controlled silicon motor control4) Spring: multi-spring balance5) Loop detector ... 5A, DV 12V/1A8) Wireless remoter(optional): two button remote transmitter, distance>20m9) RS 485 interface: 9600bps, ASCII ...