... w/speaker ,2.Torch,3.SirenOPERATION PRINCIPLE:WITH FREQUENCY RECEIVER PRINCIPLE, BY HIGH FREQUENCY MAGNIFYING,MIXING, OUTPUT TO SPEAKER FUNCTION: 1)FM ... )TORCH ,3)ALARM CHARACTERISTIC: 1)PORTABLE 2)CHANGEABLE FM/AM DUAL-FREQUENCY 3)HIGH-PITCHED SPEAKER Product Size: 16x4.5x5CM Packing Details ...