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Portable jump starters are compact devices equipped with a rechargeable battery and jumper cables, designed to provide a power boost to a vehicle with a dead battery. These devices are typically small enough to be easily carried in a vehicle's trunk or glove compartment, allowing drivers to jump start their own vehicles without the need for another vehicle or roadside assistance. Portable jump starters often come with additional features such as USB ports for charging electronic devices, built-in flashlights, and air compressors for inflating tires.