... larger capacity lead acid battery,suit for mass consumption. 2,larger power speaker,distance play.3,high clear music playing, give you ... ,auction and so on.Technical Specification1,frequency response 50Hz-13KHz2,speaker power 10w3,working temperature -10°C-45°C4,service time ... using,please replace batteries or charging for charger at sight. 2,please aim at the top of microphone when you speaking ...