Here's the great sounding horn you've been waiting for. Complete kit comes fully assembled for easy installation. All components are already attached to the specially designed mounting bracket. Entire unit mounts under the hood with the option of mounting the air horns on the top of the vehicle. Kit includes everything needed: Dual horns, electric compressor, air tank, hoses, fittings and mounting brackets. Horn has an exclusive sound chamber, rugged die-cast construction, s.s. diaphragm, and chrome plating. Doubles as an on board air compressor for external use. Whether you are on the road, or off road, or just at the beach, with full tank pressure up to 135 psi, this on board air system can not only blow you away with the sound of it's horns, (135db) but can also pump up anything else you need. Comes with extension and coiled air hose. Horn measurement only: 15-1/4"L x 7"W x 3-3/4"H Decibels: 135 db Will not work on a 2008 H2.