... full-charged)9.Full speed working time:about 3hrs(with maximum volume and laser on when full-charged)10. Working temperature:+10 ... mp3 player music stick built in battery and memoryThis laser projector is designed with a very handy mounting bracket, which allows it ... , raves, bars, nightclubs, or even your living room. This laser projector with MP3 , Hi-Fi speakers and FM Radio is in high ...