High quality, high capacity, compact and portable. Designed to fit the contour of iPhone 3G/3GS precisely. Can protect you iPhone 3G/3GS from scratches and dust. Convenient to power up your iPhone 3G/3GS anytime and anywhere. Used as a backup battery for your mobile phones. Compatible with iPhone 3G/3GS. Built-in 2000mAh Lithium-ion battery. Input voltage: DC5.0V/1.0A. Output voltage: DC 5.0V, 500mA. Capacity: 3.7V/2000mAh.
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