20 Watt Megaphone covers 900 yards or about nine football fields.  Durable ABS plastic construction stands up to toughest conditions.  Features comfortable pistol grip with wrist strap.  Battery strength indicator lights (low, mid, hi).  3 Modes includes talk, siren, and whistle with decibels of 116 d b. The Lithium-ion battery pack delivers up to two times more operating time than standard batteries.