IT'S NOT JUST A UNIVERSAL CAR CHARGER, BUT ALSO A SAFETY HAMMER WHEN EMERGENCY ARISE. DUAL USB PORTS DESIGN, YOU CAN CHARGE YOUR PHONE AND TABLET PC AT THE SAME TIME. OVER OUTPUT AND INPUT PROTECTION. SHORT-CIRCUIT PROTECTION. EXCELLENT HEAT DISSIPATION. YOUR CUSTOMIZED LOGO CAN BE LASER ENGRAVED ON THE BOTTOM. 2 1/2" H X 1" DIAMETER