Once the pressure drops to 90 PSI the compressor will kick on and pump back up to 125 PSI. Requires 12 Volt DC Power Source. Pumps 2cfm at 0 PSI. Equipped with an automatic shut off that will enable if the compressor goes above 175°F and restart once it has cooled to 158°F.In the event the of the item fail due to manufacturing defects during intended use, we will replace the part by free. Warning: Some products can expose you to chemicals including Chromium (Hexavalent Compounds), which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to California goverment website, you can search California P65Warnings. For replacements, please notice us within 60 days after you receiving the item. Items are aftermarket, so, most items don't include instructions. The item "12 Volt 4 Trumpet 150dB Air Horn Compressor 3ft Hose Train 125 PSI Kit Truck" is in sale since Saturday, July 14, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Interior\Steering Wheels & Horns". The seller is "afauto2016" and is located in Walnut, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation.