The PMP48IR is part of the latest megaphone offering from Pyle. With each iteration of flagship megaphones, we've improved the battery life, power and ergonomics. The included lithium battery provides long-lasting power and saves money on batteries. Plug in your MP3 player and broadcast your digital audio or music for everyone to hear. This model has 40 watts of power, so your voice will be heard from 1,000 yards away. The PMP48IR is equipped with a 10 second memory - perfect if you need to broadcast the same message repeatedly. And if you simply need to get everyone's attention, switch to the siren mode to activate a loud, powerful alarm sound. Works great for indoors or outdoors.