Main Features:? Multifunction: Play music, listen to radio programs, glare flashlight? High quality aluminum shell protection grade? Powered by large capacity 1800mAh 18650 lithium ion battery ( included ), can work in 8 to 10 hours in MP3 mode, can work 5 to 6 hours in flashlight mode, can work 3 to 4 hours when MP3 and flashlight are used at t...