... 11 years experience 2. Humanized clutch, 3. electronic limit switch, 4. automatical backtrack, 5. water-proof housing Product Information ... ablity. C. High sensitive limit switch, barrier boom can be instant turn on and off, accurate location.D. Control system adopts ... . The barrier is provided with remote controllor, manual button, and digital vehicle detector Parameter Voltage 220V(110V)FrequencyAC ...