BLACK+DECKER J312B Power Station Jump Starter: 600 Peak/300 Instant Amps, USB Port, Battery Clamps Delivers jump-starting power with 600 peak amps and 300 instant starting amps Reverse polarity alarm alerts when there is an improper connection; Connect the clamps to the battery, turn on the switch and start your vehicle USB port provides portable power for electronic devices Meets ETL safety standards for performance and safety Charges using a standard household extension cord (sold separately)