Description 2 It is durable and convenient 3 Simple user instruction and easy to use 4 It can replace you pickup truck Van Boat air horn Specification Color RedSize approx 91 6mm 3 6 L x 109 9mm 4 32 W x 150mm 5 9 H Detail size as shown in the picture Material Plastic and metalVoltage DC 12VRelay Voltage DC 12V 30A Fundamental frequency 530Hz5 Sound pressure level at 2m ≧115dB A Sound pressure level at 4In ≧139dB A Reliability 100 000 on off cycleType of sound harmonized twin tone Note Please allow 0 5 1 inch difference due to manual measurement 1 inch 2 54cm Package Included 1 X Hore1 X RelaySome install fittings