1. 11 years experience 2. Humanized clutch, 3. electronic limit switch, 4. automatical backtrack, 5. water-proof housing Product ... Excellent rust-proof, waterproof ablity. C. High sensitive limit switch, barrier boom can be instant turn on and off, accurate ... 6s. The barrier is provided with remote controllor, manual button, and digital vehicle detector Parameter Voltage 220V(110V)FrequencyAC ...