For the active on-the-go musical performers, who demand top-tier sound in a portable solution, the Alto Professional Busker is a battery-operated PA that will be at home on any stage and allows you to play and perform anywhere. The Busker features a 200W amplifier that powers the optimized woofer and tweeter with a frequency response of 60 Hz to 20 kHz with a max SPL of 106 dB. The built-in lithium-ion battery offers up to 90 hours of use in Eco mode and up to 30 hours in standard mode