Support 3D Stereo Surround Sound Two Wireless Microphones Support Even Hello Tone One Button Elimination Play Micro SD Card 3.5mm Input USB Stick Or Wireless Via Bluetooth Built-In 7.4v / 2000mah Lithium Battery Pack. 20w Super Powerful Audio Output Feature: Play Music Battery: Yes Smart Personal Assistant: None Channels: 2 (2.0) Cabinet Material: Plastic Communication: AUX, Bluetooth/ USB Drive. Power Source: Battery, AC Output Power: 15w*2 Support Memory Card: Yes Support App: No Built-In Microphone: Yes Frequency Range:100Hz-18KHz PMPO:20w