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. SPRING ELASTICITY DESIGN TO PROTECT THE CHARGER FROM DISCONNECTION WHEN DRIVING. 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