Technical Data Rated Working Voltage: DC13.5V Working Voltage Range: DC10.5V--14.5V Rated Working Current: 26.6A+-2.0A Static Working Current: <=120mA Rated Output Current: 150W + 150W Output Impedance: 6ohm + 6ohm Sound Frequency Range: (300Hz-10KHz) +- 3dB Siren Frequency Range: 430Hz-1945Hz Ambient Temperature: -40C--+70C Waterproof Performance: non-waterproofing Shock Resistance Performance: 20m/S2 GB 8108-1999 Mounting Mode: Panel Inserting, Featuring of detached structure, mounted inside of vehicle only. Remark 1.five Siren tones: WAIL2, Hi-Lo, YELP, HORN, YELP 8S 2.Without Light control function. 3.Having Triggering fuction, positive triggering to be effective;Siren tone of YELP 8S can be triggered .