Be fixed on handlebar when riding bike,weared on arm when doing exercise,Line-in function,work as extra speaker for laptop, etc. Key Features:• Play Mp3 WMA music• Flash Built-in 1G to 8GB Optional)• Support TF Card • Line-in function, work as extra speaker for other digital device, like PC, Mp3, Mp4 player, etc. • FM function included• Built-in lithium battery, working 10 hours • High quality ...