Portable 4000mAh external power bank charger
Speaker function， take off your earphone and enjoy true music at anytime and anywhere
Stand function for your visual needs
USB 2.0 and 3.5mm interface design
Repeatedly use of a single charge， portable design， convenient to carry
Fit for cellphone， MP3， PDA and other digital products
Perfect power supply for business trip， travel， field work， etc.