... Well processed aluminum metal surface suitable for both outdoor and indoor environment.•Built-in Hi-Fi high quality and high efficiency speaker,enables you ... jerry The outer 1400 mah lithium battery, may meet computers, mobile phones, MP3, etc, can also play audio source TF card ... time.>Play time:10~22 hours with loudspeaker(depend on the volume)70 hours with earphone.>Charge time: USB charge:7 ...