The yamaha stagepas 100btr mkii is built for performers presenters and educators needing portable sound anywhere.with a rechargeable lithium ion battery you can run cable free for up to six hours making it easy to play outdoors host pop up events or move between rooms without power sockets. The 100w class d amplifier and coaxial speaker design help maintain clarity and balance even at higher volumes while keeping the unit compact and easy to carry.a built in three channel mixer lets you connect microphones instruments and line level sources directly with simple level controls and two band eq on the front panel. Bluetooth and usb audio add flexible playback and streaming options so you can play backing tracks run online sessions or connect to a computer or mobile device without extra gear.