SAFETY HAMMER 2IN1 USB CAR CHARGER ALLOWS YOU TO CHARGE TWO DEVICES AT THE SAME TIME AND ALSO FEATURES SAFETY HAMMER TIP FOR EMERGENCY SITUATIONS. SAFETY HAMMER ALLOWS YOU TO SAFETY SHATTER/BREAK THE CAR WINDOW IF YOU GET TRAPPED IN YOUR VEHICLE DURING AN EMERGENCY. INTELLIGENT CHIP FEATURES A PROTECTION CIRCUIT THAT PREVENTS OVERCHARGING, OVER VOLTAGE AND SHORT CIRCUITING. PREMIUM METAL DESIGN IS GREAT FOR SILKSCREEN OR OPTIONAL LASER ENGRAVING INPUT: DC-24V, OUTPUT: USB 5V 2.1A. 2.28" L X 0.99" DIAMETER