He description:
appearance size: 3.5cm*2.0cm*1.4cm (l*w*h)
charging output: 300-500ma outputdc5.0v
standby time: 12 days. working time 4-6 days
network system: gsm/gprs
working voltage: 3.4 - dc 4.2v
basic parameters: band gsm850/900/1800/1900mhz
often encountered problems: