50W power; Powerful piezo driver & large bell diameter for projection range up to 1 mile; 2 modes: talk & siren; For indoor/outdoor use; Variable volume control; Ergonomic pistol grip & lightweight chassis; USB input to play music & recordings from flash drive up to 6GB; Requires 8 C batteries; Dim: 9 dia x 13.75L; Weight: 2.86lbs;