Piston Power Pro 12000 is an 15mm sleek, portable, super battery pack that is thoughtfully designed for on-the-go use. The high capacity 12000 mAh battery has enough juice to charge most smartphones up to 6 times, or tablets up to 2.5 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!