The Persang Octave 38.1 CM (15) Active Trolley Speaker is perfect for indoor and outdoor use. You can record your singing through Bluetooth Music and vocal both. It has 2 VHF Wireless Microphone Free, 2 Wired Mic input & 1 Guiter input. FM Radio, USB/TF & MP3 Function, Installed Handle and wheel for easy carrying. Built In Rechargeable Battery to play music up to 4 to 5 hours. Treble and bass independent adjustment. Play Karaoke Song via you tube or App.