... is exposed, 2.safe and sealed,made of fire-retardant materials mifare card switchBWS90X energy-saving switch is a special switch for ... conservation.All the switches can only use the same hotels card to get power. CharacteristicsNice shape and small sizeIt is convenient ... , the room can still be supplied with power.Technical ParameterSuitable card size: 54*85*0. 8mm;Suitable voltage: 180V---250V, 50Hz ...