Thestrong NbFeB magnet made 100 watt siren sound ,
sound pressure :120-130dB , widely used in police vehicles ,
fire trucks ,hospital ambulance vehicles ,and all kinds of
emergency vehicles. small size can be used in any vehicle and
cruiser ,it has powerful function and power when we installed correctly .
To install , simply connect it to vehicle battery , and install controller
in driver's cab .A mounting bracket and needed wires are included with
the siren speaker purchase to make this process simple and easy .
Impedance ：4 ohm