Iztoss Car Motorcycle Truck 12V Red Compact Dual Tone Electric Pump Air Loud Horn Vehicle Siren with relay Including a relay and other parts for the air horn.Size: Horn Diameter: 3.5" Horn Length: 8.7",Usually US delivery : 7-12 working days from Dispatch. Power: DC 12V/Sound level @ 2m: 115dB/Sound level @ 10cm: 136dB Frequency: 530/680Hz / Color: Red Fitment: Fits on Any 12 Volt Vehicle (Car, Truck, SUV, Motorcycle, Yacht, Boat, off Road Vehicle, Busses etc.) Easy to Install (Mounts with only 1 screw)