? 30W power;? 800-yard range;? Voice recording & playback capabilities;? 10-sec integrated audio memory;? Used by US Armed Frces;? For indoor/outdoor use;? Variable volume control;? Tough ABS housing;? Built-in siren;? Dim: 6.25H x 6.25W x 10D;? Weight: 1.15lbs;? Requires 4 D batteries;