... NTP/UpnP3uSIM socketU SIM socket,Allowing users to remove the lithium battery into installation mode. 4Audio input One 3.5mm composite ... ,Maximum support 16G capacity,allowing users to remove the lithium battery into installation mode,remote call centre support for video ... ,and take photo for flash vibration.21LithiumBuit-in 2700mAh lithium battery,can support 3 hours,and support to change the ...