【Loud megaphone】 30W power amplifies voice that can travel up to 800 yards. Never strain your voice. 【Siren mode】 Draw audience's attention fast by blasting loud emergency audio with a push of a button. 【Volume adjustable】 Control the bullhorn audio output using the button in the back of the megaphone to your liking. 【Multi input】 Connect an external audio source with a USB/SD card and expand your communication options. 【All weather use】 Heavy-duty ABS build, sturdy and weather-resistant, ensures longevity and reliability. This is an updated description for the 5 CORE Megaphone. High-quality PA speaker with 30W output, 800 yards range, rechargeable battery, lightweight and portable for outdoor use.