Siren speaker. 30 watts, with switch ,3.75W,7.5W.15W,30W Siren speaker.30 watts, with switch ,3.75W,7.5W.15W,30W Model No:ZT-711Rated Power:3.75/7.5/15/30WImpedance8ΩLine Voltage:70/100VSensitivity110dbFrequency Response:300-8000HzLoudspeaker\DimensionsΦ205X285X280mmWeight:1.86KG