Viking Horns V107C-2/4008 Loud 149 Decibels 4 Trumpet Chrome Plated Metal Air Horn Kit Sound output:139 decibels Construction: All chrome plated metal Tank Capacity & Size: 1/2 Gallon, 6" L, 5-1/4" H, 5-1/4" in diameter 12 volt 110 PSI heavy duty air compressor Trumpet sizes:13-3/4", 11-1/2", 9-1/4", 7-3/4" with 3-3/4" front diameter each