Review on Wolo (402) Air Max Black Plastic Trumpet Horns - 12 Volt, High and Low Tone: Powerful and Versatile Horns for Enhanced Vehicle Safety by Matt Chirila

Ordered direct from Revain.com with no shipping or handling hassles. Replaced 10 year old horns that didn't work well in cold weather. The documentation advises that if you don't have a 20 amp horn circuit, a 20 amp fuse should be used and horns are supplied with the relay. You must provide your own cable. Actual amperage is about 8-9 amps, but according to Volo it can double to 16-18 amps, hence the suggestion for a 20 amp fuse. Volo also pointed out that if the sirens are connected to car alarms, flashing them briefly can cause the engine to burn out prematurely. Do not recommend this horn to people who have no experience with vehicle wiring or air horns. The horns will fail after 9-12 months of use and the warranty is only 3 months. We recommend that you contact Wolo directly if you are interested and ask why there is no better guarantee.