Built-in Protected Circuit: Yes; Auto Circuit Detection: Yes; Over Voltage Protection: Yes; Short-Circuit Protection: Yes; Over-Charging Protection: Yes; Over-Discharging Protection: Yes; Green design of switch, its lifetime is longer than others; Comes with power cord, easier to reach the power outlets, it improved the safety; Built-in protective circuit module, it will be safer, and made of high quality material, which is high-temperature resistant and fire proof; one 5V / 2.1A interface, one 5V / 1A interface, two 5V / 0.5-1A interfaces, it can charge for Mobile phone, Tablet PC, Portable power, Digital camera etc..