The "STANLEY 1000 Peak Amp Jump Starter with Compressor...packs 500 amps of instant starting power, as well as 1000 peak amps, offering a convenient, portable way to jump-start your battery without relying on another vehicle. All you need to do is connect...the clamps to your battery, turn on the switch and start your vehicle. A built-in safety system sounds an alarm if you connected the clamps incorrectly. This jump starter also has a built-in USB port, highly useful if you need to charge your phone, and the 120-psi compressor can help with low tires. With enough power to jump-start your car, truck, motorcycle, boat, RV or tractor, the STANLEY Battery Jump Starter is ideal for everyday use or roadside emergencies..." -- Amazon.com.