Our boss was looking for a loud horn to use at a company event to get everyone's attention. BOY, DOES THIS DO THE JOB !!!! (we purchased the Milwaukee Train Air Horn M18: Dual - BossHorn × 1 Tool only / Red). Loud is an understatement!!!! I cant imagine what the 4 horn sounds like!! Our property is 14 acres of open space. The sound reaches every corner of the property. Well made. Easy to assemble (all you have to do is screw on the horns, attached the battery and press the trigger) BOOM!!! Btw, THE BOSS LOVES IT !!