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1. Safety reversal: All the garage door opener furnished with safety reversal feature. The door has two sensors situated six inches across the floor level, either side in the door. When any object like pet, child or anything else, speak to light beam created by sensor even though the door is closing, the entranceway stops and reverses. If your opener have not this safety reversal feature, change it out as quickly as possible.
Also known as the sleeper plate circuit. It is a prestressed concrete sleeper plate, which is laid in a compacted bed, and the wires are filled with asphalt or other materials. The prestressed concrete sleeper plate is 55cm wide and twice as wide as the normal prestressed concrete sleeper, with the same length and thickness as the ordinary prestressed concrete sleeper (see color map). Therefore, the contact area between the wide sleeper and the daoist bed doubles the contact area between the normal sleeper and the daoist bed, thus reducing the pressure on the bed
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