Schumacher FR01666 250A 6V/12V Timer-Controlled Battery Charger and Jump Starter, the ultimate tool for wielding complete control over the battery charging process. With the FR01666, professional and home mechanics can take advantage of the 135-minute timer and Charge Rate selector switch to personalize their charging experience, ensuring precise control at every stage. Equipped with a powerful 250 cranking amp (12V) engine start capability, the FR01666 is capable of jump starting cars, SUVs, trucks, RVs, and other large engines with ease. Thanks to its three boost modes - 50A 12V, 25A 6V, and 25A 12V - deeply discharged batteries can be rejuvenated swiftly. The FR01666 also features a 10A 12V charge mode for simple battery charging. Designed to be compatible with a wide range of automobile battery types, the FR01666 works with standard, AGM, and gel batteries.