SHENZHEN VICTPOWER TECHNOLOGY CO.,LTD. KING-TRONICS INTERNATIONAL ELECTRONICS CO.,LTD.(HK) back up battery for iphone 3G 3GS 1)Product Description Type:king-2000 Capacity:2000mah type: li-ion battery cell input:DC5.0V,800ma Output :DC5.0v,700ma Power: press Test button, four LED indicator shows power Charging display: LED light shine 2)Application iphone 3G/3GS with sync function laptop external battery for laptop ipod iphone etc emergency charger for mobile phone backup battery mini emergency charger mobile phone battery charger. 3)Other Information Payment:T/T in advance Delivery UPS,TNT,EMS,Airline,Boat Minimum Order 50PCS Packaging 50PCS/carton