The button shows power volume as follows:
1.Do not throw battery into water or make it wet;
2.Keep the battery away from heat source(like fire or heater);
3.Do not throw the battery into fire or heat the battery;
4.Forbid to hammer to trample the battery;
5.Forbid disassembling the battery in anyway.
1x External battery for iPhone 4/4S
1x USB sync data and charging cable
How to charge:
Method 1:Connect the battery and computer USB port with USB 2.0 cable.
Method 2:Connect the battery and USB home/wall/AC/car chargerwith 2.0 cable.Then insert the charger into AC 110v-220v power outlet.
How to charge your iPhone:
Step 1:slot in your iPhone
Step 2:switch on button of battery pack
Step 3:close the roof cover