SPECIFICATIONS INPUT: DC 12V-24V OUTPUT: 5V / 2.1A (10W) FEATURES This car charger is equipped with Smart IC chip and a fuse to protect your phone from over charge or a sudden surge of power that may damage the phone or battery. It also rapid-charges your battery while driving or during use. INSTRUCTIONS Plug it into cigarette lighter socket, a LED will light up. Unplug cell phone to disconnect, pull out the cigarette lighter adapter. It may not have power if your car key is on off position.