Electronic Siren, Input Voltage 11 to 15 VDC, Operating Temp. Range -30 Degrees C to +65 Degrees C, Frequency Range 70 mA, Height 2.3 In., Width 6.1 In., Depth 7.6 In., Impedance Depends On Speaker Selected, Depends On Speaker Selected Decibels, Wattage 100, Requires 12Z046 and G5924554, Standards Meets Class A and SAE J1849 Sound Output Requirements, Includes Wiring Harness, Five Basic Siren Tones, Tap Ii (horn-ring Transfer), Pa, Radio Rebroadcast, And Air Horn Sound With Siren Override