The Schumacher SE-82-6 Battery Charger is a single unit designed for charging 12V batteries. It features automatic charging capabilities, making it convenient for users who want a hassle-free way to keep their batteries powered up. The charger comes with a user manual as an accessory, ensuring users have all the necessary information to properly use and maintain the device. Perfect for car enthusiasts and mechanics, this Schumacher charger is a reliable and efficient tool for keeping your vehicle's battery in top condition.