Features BEA-8000U2 Beacon Line Array with Bluetooth and Two Built-in Wireless Receivers 120dB of clear sound, reaches crowds of 3,000+ indoor and 2,500 outdoor Lightweight array tower has eight 4" speakers, Base has three 8" subwoofers True AC/DC, 100-240V power supply, 150W AC mode / 125W DC mode Frequency Range: 540-570 MHz Description Product Description The Beacon with Two Wireless Receivers is a portable, line array speaker that folds up into a durable case on wheels, with a retractable handle & nylon storage bag. It unfolds in less than a minute, and stands about 6 feet tall. It includes two built-in 16 channel wireless receivers. The lightweight array tower has eight 4" speakers, and the base has three 8" sub woofers. It has built-in rechargeable batteries, operates 6-8 hours on a full charge, and there is a battery charging LED bar indicator on the back. It comes with a USB port for charging an MP3/iPod. It also has two universal microphone input jacks. There is no stand needed, just roll it into place. Use it indoors/outdoors at sporting events, graduations, outdoor camps, auditoriums, and more!