Boom Barrier Torque motor,steady,low noise,5 million 100% duty cycle,heavy duty Fault auto-detect,swing away Free maintain Intelligent Automatic Boom BarrierDescriptions1) This boom barrier provides open/close time: 0.8 / 1.5 / 2 / 3 / 4 sec. optional2) Straight arm with rubber bar, Max.length following: 6m for 4 sec. & w/o anti-collision 4m for 4 sec. & with anti-collision 5m for 3 sec. & w/o ...