This car charger is compatible with Samsung Galaxy S III 3 GT-I9300 and can be used to charge your phone while on the go. The charger is designed to fit into your car's cigarette lighter socket and has a micro USB port for connecting to your phone. With its compact and lightweight design, this charger is perfect for travel and can be used in any vehicle with a cigarette lighter socket. Its high-quality construction ensures durability and reliability, making it a great investment for anyone who needs to keep their phone charged while on the road.