ThunderPower THUN250 Extra Loud ThunderPower 250 Megaphone - 25 Watts of Power 25 Watts of power, approx. 800 yards range. Ultra durable construction; Pistol-trigger switch Volume control; 1 year warranty Dimensions: 15" length x 10" diameter bell & Weight: 3.8 lb (no batteries) / 4.7 lb (with batteries) Siren/Whistle; Uses 6 C batteries.