Internal rechargeable lithium ion battery for up to 12 hours of continuous use; Bluetooth connectivity to connect wireless music sources; 2-way speaker enclosure w/ 12" woofer & 1" tweeter, Class D amplifier produces 300 watts of Peak power; 4-channel mixer w/ 2-band EQ (Bass & Treble), Side microphone mounting clip for wireless mic storage; Includes Concert 88a Handheld Frequency-agile UHF Wireless System (300' operating range)