Energy cost accounts for a large proportion of the daily cost management of hotels. No matter how the guests behave, the hotel itself should have deployed an energy-saving system in advance. An energy-saving switch is an indispensable part of the available equipment to help hotels save energy. When a user removes the card from the energy-saving switch for more than 10 seconds, the controller will turn off the power in the room, such as the AC power and the lights. With the help of the energy saving switch, hotel operators can easily avoid unnecessary energy costs. For example, When guests leave the room with their room key, the air conditioning will be turned off automatically.