Room Lighting and Air Conditioning Control Device GR-57/A 930057003
They are placed in hotels and rental rooms to control the power supply in the rooms.
They work in conjunction with a GR-43 device.
When the occupant leaves the room and removes the special magnetic key from the GR-43 slot, after 60 seconds, the power supply to the room is turned off.
If the key is re-inserted into the socket the power supply to the immediate.
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