The Silicon Power GS15 powerful battery bank is for use with all devices that can be charged via USB. The 20000 mAh capacity ensures 4–6 full charge cycles in almost every smartphone. The GS15 is equipped with two USB output ports, one MicroUSB port and one USB-C port, which allow you to charge two devices at the same time. SmartFOCUS advanced calibration technology stabilizes voltage currents throughout the charging process to maintain maximum charging power. SmartSENSE intuitive and universally compatible charging technology maximizes charging speed and automatic pairing with almost any device. SmartSHIELD provides comprehensive 12-point ssafety guard that ensures total protection against vulnerabilities for both users and devices. At the touch of a button, the indicator provides information on remaining battery power and wakes up Apple iPhones and iPads.