BLACK+DECKER BC6BDW 6 Amp Waterproof Automatic Battery Charger/Maintainer 6 amp battery charger and maintainer is compatible with any AGM, GEL, or WET automotive or marine 12V battery Fully automatic high frequency charging; AC low-voltage compensation ensures maximum performance when used with extension cords Features an IP67 rating which certifies a completely sealed, waterproof and dust proof housing capable of withstanding direct water or rain exposure Built-in circuit protection guards against overcharging, reverse polarity, and short circuiting; ETL Certified for performance and safety Offers 2 ways to connect: 12V DC accessory plug or battery clamps; Hanging hook and magnetic backing allow for convenient, hands-free operation