promotional smoke detector 1.9V Battery; 2.High alarm 85dB(3m) ; 3.Test button; 4.Low battery warning,CE,ROHS EN14604 promotional smoke detector conforms with ul standard, and is used to detect smoke and fire.PW-507S Stand-alone UL smoke detector is under BSI approval, and can be calibrated into either UL, VDS, NF Standards. This smoke detector features UL-approved Photoelectric sensing ...