For iphone 3gs part 

standby time: up to 300 hoursvideo playback: up to 30 hours

specification:1,input DC5V/1A2,output DC5V/0.5A3,Capacity: 1330mAh4,LED indicator for charging 

Compatible (available compacity)

iphone(3rd Gen )

iphone(3rd Gen)

Shipping:

estimated shipping weight  0.02kg.

this item can be shipped to all destinations around the world

 item ship out with  in 1-3days after  confirmation of payment.

tracking no will be emailed  to you once we have shipped your order.

Warranty:

can turn back in seven days after you  receive the pacakage if there  are some quality problem,but  don't take responsibility for the damage caused by assembly.

For iphone 3gs part