For quality automotive tools that are built to last, professionals look to the Schumacher DSR ProSeries line of battery chargers and jump starters. With a durable design and powerful dual internal lithium batteries, the Schumacher DSR ProSeries 4000 Peak Amp 12V Lithium Portable Jump Starter can be relied on to get the job done. The DSR164 boasts 4000 peak amps of power, ensuring enough power to jump start 10-cylinder gas or diesel engines either in the shop or on the road. Featuring the latest Pre-Heating technology, which warms batteries in extreme cold (-13°F/-25°C), the DSR164 provides superior jump starting even in cold weather. Another advanced feature is Pre-Boost technology, which safely adds a pre-charge to deeply discharged batteries. With the DSR164, its built-in features make any job easier. The integrated work light has three lighting modes, which lets you customize the light output for any task. And because the light is front facing it can be easily positioned to illuminate the engine compartment. The DSR164 also includes a 2.4A USB port that lets the unit function as a portable power source for USB devices. Because the DSR164 is built for professionals, it features durable construction and heavy-duty 4-gauge, 30-inch copper cables that will stay flexible in cold temperatures. It also features color-coded copper clamps and a 15V 2A port (input) for the included 12V DC and 120V AC chargers.