... DC battery,Photoelectric sensor. 2.Red LED indicate alarm ,nice appearance. Wireless smoke detector——AF-19DescriptionWidely used for room, hall, kitchen, ... Factory.Alarm mode: while smoke density reach the limited, it gives off alarm warning as well as sending wireless signal to alarm panel, ... rated to 24 volts/1 amp resistive. 7.Alarm supplied with “ connector plug” for easy of installation ,built ...