It can easy attach to your iPhone for backup power and can also be charged by sunlight. It also be charged with the traditional USB cable, laptop or computer (requires USB cord adapter). LED indicator lets you know the battery status. 

Solar iPhone charger specification: 
*Solar panel Power: 0.8w 
*Built-in battery capacity: 2000mAh 
*PC USB DC input: 5v/500mA 
*AC adapter input: 100-240v 
*DC output: 5.5v/800mA 
*State display: 4 LED bar for battery capacity 
*Protection: Reverse current protection circuit integerated to prevent batteries from being discharged, overcharged and short circuit 
*Charging time: For the built-in Lithium polymer battery using computer USB charging cablel: 4-5 hours 
*Accept device: I-POD, iPhone, iPhone 3GS, nano4, touch2, Nokia, Motorola, Sony Ericsson and Samsung 
*Accessory: 1 computer USB cable, output cable, 5 PCS power plugs 
*Size: 126x66x23mm 
*Weight: 120g

Packing:	Carton
Standard:	CE, RoHS
Productivity:	5000/Month
Unit Price/Payment:	T/T, L/C
Trademark:	SUNNYBP
Origin:	China
Min. Order:	50
Transportation:	FOB/Shenzhen
Type:	Lithium-ion
Charger:	Yes
Shape:	Open Cell
Discharge Rate:	High Discharge Rate
Nominal Voltage:	4V
Size:	126x66x23mm
Export Markets:	North America, South America, Africa, Mid East