1. Works with all USB-powered devices including Android & Apple smartphones & tablets. 2. 3 USB ports can charging 3 devices at the same time. 3. Smart matching current. overload, overvoltage and overheating, overcurrent and short circuit protection. 4. Advanced circuitry and built-in safeguards to protect your devices against excessive current, overheating, and over charging. 5.fuse: strengthen the protection of charging equipment. 6. USB rubber core, high temperature resistant rubber core, is made of iron, nickel plating.