Piston Power Pro 6000 is an 8.5mm sleek, portable, super battery pack that is thoughtfully designed for on-the-go use. The high capacity 6000 mAh battery has enough juice to charge most smartphones up to 3.5 times, or tablets up to 1.5 times. With the built-in LED battery indicator, you know just how much juice you’ve got left. The built-in Smart IC Chip auto detects your device and provides the most efficient amount of current (volts). This will help decrease charging time and will preserve your device’s battery!