Bridge-type Swing Barrier Gate Structure: 304 grade stainless steel case (thickness: 1 ... , will close when the power is on; meets security requirement.With automatic self detection and alarm warning functions, ... for open, it will lock tightly. Single/double swing functions, can control people entrance/exit in single or ... -+75 degreeRelative humidity: ≤95%, no drew Bridge-type Swing Barrier Gate YET-B302