The hotel adopted ABLE switch to gain power, When leaving the room, the guest take the key card away (you have to pull out cards, because you would also like to use this card to open the door when you back),Energy –saving switch will cut off the power within 20 seconds automatically. It can bring direct economic benefits (electricity savings) for the hotel, to extend the life of electrical equipment, to enhance guest safety factor of electricity, to achieve energy-saving effectively for hotel. Investing least cost to reach the effect "energy-saving emission reduction" for the hotel.