Features:
* Easy installation, spring balance debugging, superior quiet and stable operation
* Self-lock on closure position
* Manual release & operation on power cut
* Opening & closing force adjustable (DC Motor)
* Reverse on obstacles (DC Motor)
* Multi-connection available by remote control, button switch, safety beam sensor, loop detector, battery backup, air pressure manometer, night-view safe light, road toll system etc.
* Mechanical and electrical double limit switch guarantee the full opening distance and angle
* Self protection against over-heat, over-voltage, over-use
* Working as usual in the extremely cold air
https://www.chinaautomaticdoor.com/automatic-barrier/metal-boom-barrier/boom-barrier-gate.html