I-wing4 Case+Battery for I-phone 4 (1600mah) Certificate for Apple. Made in Korea. This product is a supplementary battery for I-Phone 4 using 1,600mAh Lithium Polymer battery. This product is composed of protect case/ supplementary battery strap ring & wire/USB charing cable/user's manual. Automatic power cut-with no device connected, power is automatically cut to prevent electric discharge