... .360-degree sound field intergrates a cone design with a custom-built speaker to project sound in all directions.4.With 1 ... .More convenient and user-friendly, cost-saving pruphase batteries.9.Built in, rechargeable lithium battery each charge can last for 3 ... 2).Compatible with mobilephone,Mp3,Mp4,Ipod,PDA.Etc 3).Built-in rechargeable Li-ion Battery,can be recharged by USB ...