The PMP38R 30-Watt Megaphone/Bullhorn from Pyle Pro features a rechargeable lithium battery, 30W of amplification and an 800 yard projection range. It also features a 10-second memory, allowing you to record an announcement that needs to be given repeatedly and replay it at the press of a button. It also has a siren function, for getting attention quickly.
The PMP38R is used by the U.S. Armed Forces. It has an ergonomic pistol-style grip and a lightweight full ABS chassis. In addition to the included Lithium battery, it can be powered by four D-cell batteries.