This megaphone is ideal for announcements and rallies with a variety of features and effects all in one. This unit records up to 120 seconds of audio for loop playback. The unit includes three sound effects: Siren Whistler and Hoot. This unit plays music files prerecoded onto a USB flash drive or SD memory card. It will also output audio from using it s 3.5mm Aux Input such as from a cellphone headphone connection. It will recognize files of the following type: MP3 WMA and WAV media audio. * Extendable microphone/digital combo controller head to a length of more than four feet. * 50 Watt Output Max. * LED status Indicator lights. * Battery life: from 8-10 hours approximately. * Usable clear distance about the length of a football field. * Can be heard up for up to a kilometer distance. * About a 9-in diameter horn. * O-ring sealed quality construction. * Weather resiatant plastic outer housing. * Uses eight C-Cell Batteries. (not included) * Works with model: PYRAMID PSV6K 12 Volt DC adapter. (not included) * Will accept lithium batteries for recharging.