Wireless Bluetooth trolley speaker with LED display Digital Karaoke Professional treble & bass gain controlling circuit Built-In professional wireless microphone system Built-in MP3 encoding support Connection Type: Bluetooth, USB, FM Radio, TF card, Aux in port, Mic In Compatible with DVD/PC and other sound sources Intelligent power switch charging circuit User-friendly Trolley 8 meters Operating Range Up to 4.5 hours of Playback Battery capacity: 2200 mAh Total Output: 40W RMS Controls: Volume, Mode and Track Controls Subwoofer Size: 8 Inch Weight: 6.5 Kg Product Size: 31 x 26.5 x 49 cm