Backup battery case for iphone,iphone 3G

Features:
size of outline: 130*60*2.3mm
Port of charging: ipod 30pin(famale)
port of output: ipod 30pin(male)
color:black
weight:125g

Technical Specifications:
Capacity of battery ≥2000mAH Voltage: 3.7 V
Voltageofcharging:DC5V;Themaximalchargecurrent:500mA;Charge mode:CC/CV
Outputvoltage:DC5.0V±0.05VThemaximaloutputcurrent:800mA
protective voltage from short circuit: 4.30V±0.05Vprotective voltage from Excessive discharge: 2.4V±0.1V
Protectivevoltagefromshortcircuit:about4A/3.7V;Recovery voltage from Excessive discharge:3.0V±0.1V
Cycleindexofchargeanddischarge:≥300times;Currentconsumption : ≤90uA
Working temperature:0℃～40℃
Keep temperature:-20℃～45℃（three month）

How to use:
Press"on"keycanenterthechargingstatus,batterycasecansupplypowerforiphone,andconnectcomputertotransferdata;Press"OFF"keyentersleepingstatus,batterycasestoppowersupplyanddata transfer
ChargeupthebatterycasewhenconnectaUSBpoweradaptor;theredlightwilllightwhencharging;whenfullofelectricitytheredlightwillbeturnoffandthe green light will be turn on automatically
Lowpoweralarminstructionswhentheredlighttwinkle
Support data exchange with the computer and will stopdata exchange when power off