External Portable Power Case Cover Power Bank Battery Pack for Galaxy S3 S III I9300 3000mAh Li-Polymer Black Battery + Protective leather case two-in-one function, perfect solution to the problem of single function of protection cover. With microprocessor it automatically detects, charges and discharges the phone, extends battery life, higher safety. Supply instant power to charge your device anytime, anywhere. Battery Type: Li-ploymer battery Band: Floureon