Offwire Powerocks Tetris 3000mAh Universal Extended Battery
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This 3000mAh universal power bank for various USB devices, is an amazing solution for re-charging your devices back up to full capacity. The power bank can charge two devices at the same time, as it has two1000mAh USB outputs. The power bank is universal and works for every USB devices including phones. Charging the battery is easy, simply plug the battery into the wall. While devices are connected, it first charges the device to full capacity, and then charges its own 3000mAh battery.