A 30X is a portable charger that allows you to recharge your electronic gadgets while on the go. With pocket-sized gadgets gives battery overvoltage protection, higher-capacity KDM Power Banks can charge smartphones, tablets, and other devices. The device protects your electronics from overheating, overcharging, and short-circuiting issues. Temperature Protection : Yes Battery Over voltage Protection : Yes Output Over voltage Protection : Yes Output Over current Protection : Yes Input Surge Protection : Yes Phone Connection Status Protection : Yes Electro Magnetic Field Protection : Yes Input Over voltage & Under voltage Protection : Yes Charge Cable Detection And Protection : Yes Charging Path Impedance Protection : Yes Output Short Circuit Protection : Yes Electrostatic Protection : Yes Battery Overcharge & Over discharge Protection : Yes