This USB charger matches UL safety standard to avoid over-load, short current and overheat Continuous high-power output will have a temperature rise, but they are all within the safety limits of standard certification. It is lightweight, stylish, small and compact wall charger makes it easy to plug and charging your device. Easy to carry & best choice for traveling. Input 100-240V 20/601Hz 0.5A Max, output DC5V3A/9V2A. Custom logo can be imprinted on the charger.