... ,R,P.3,Enhanced visibility from any direction and distance.4,Frequency of alarm:60-80 times per minute.5,Buzzer ... volume: 100-120 dB /M.6,Materials of construction:Layer of PC,lampshade of ABS,Stand of Al.7,Materials ... .Protection classification:IP54,IP65.8,Certification: CE,RoHS. EMA Multi-layer LED Signal Light Towers