The middle part of this railing is removable. When someone needs rescue on the ice or water surface, you can open the cover on the railing and take out the middle part. When you take it out, the devices in the left and right railing posts can quickly fill the Yellow airbag around the railing with gas. There will be a rope connecting the inflatable railing in the left and right columns. When the rescue personnel are finished, you can press the button on the rope to quickly retract the rope and return to the shore.