| megaphone/Mutifunctional megaphone/megaphone supplier/megaphone factory/megaphone exporterSiren High Power/Siren/Whistle Megaphone/Amplifier YMH-140:1.power sourece: 12VDC(10*UM-1)2. Max Output:110dB/1M3.Current Consumption:2A Max4.Service Lifetime of Siren:15h(Until 100dB/1M Output)5.Two Tone:(1)Siren (2)talk(3)Whistle6.Material:ABS Plastic and Aluminum7.Color: Grey8.Size:355*355*520mm9.Net Weight(Without Battery):3100g10.Transmission Distance:2500m | 
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