The ACHTS01 energy saver is as small and lightweight as a wall light switch. It is designed to cut off the power supply to some or all electrical outlets in a room or specific area when they are not in use, helping to save energy. The device can be installed in a single room or a group of rooms, as well as in living rooms. When the card is inserted into the device, it automatically turns on the power in the room. When the card is removed upon leaving the room, the power is cut off immediately.