Source of power: 8-1.5V DC battery 50–80W maximum power. Depending on operating conditions, the range is between 0.8 and 2 km. 8Ω is the speaker impedance. Weight (without battery): approximately 1.65 kg (3.64 lb). Eight-inch "C" type batteries (not included). Dimensions: φ9.1" (dia.) ×13.8" (L) φ230mm (dia) × 350mm (L)