W21 is a multi-function alarm, can through the way of telephone or SMS control equipment, can also through the phone APP to control it.Can add the remote control on the equip...展开
W21 is a multi-function alarm, can through the way of telephone or SMS control equipment, can also through the phone APP to control it.Can add the remote control on the equipment, magnetic door, infrared, such as accessories, installation area of the device in the event of an emergency it sets off t…收起
