These remote control units don't have any safety devices and designed for window openings. As there is no safety devices, the operator MUST be in sight of the shutter when operating, this is to ensure there are no obstructions ie; open window or other obstructions. The Remote Control units with NO Safety are "Hold to Run" operation, which means you have to keep your finger pressed on the button at all times to open and close the shutter. As soon as you take your finger off the button, the shutter will stop.
If you require any advice on Remote Control Units, then please contact our Sales Team.