Mifare 1 (M1) card power-saving switch is designed for energy saving and safety of hotels, guesthouses. The switch controls power supply of the room by inserting and pull of M1 card. After installation of card-in power-saving switch, when guests check-in and insert card into the power-saving switch at the side of interior door, the power is available for the electrical equipments in the room (lighting, air conditioner, television, etc. ); When guests leave the room, the guests take the card from power-saving switch (guests must pull the card out, because they have to use it to open the door after return), power-saving switch shall be off automatically after delay for 15 seconds to ensure energy saving and safety.