RoadPro's Emergency System gets your dead battery going with 300 cold cranking amps. Reverse polarity indicator ensures correct hookup, and convenient charging indicators and LED battery level indicator provide an update on the charging status. The emergency system includes an air compressor with 260 PSI to inflate tires quickly and easily and an onboard outlet for powering 12V devices with short circuit protection. System can be recharged at home or in your vehicle with adapters. High impact rubberized housing for safe, secure grip. Comes with 500mA power cord, AC/DC charging adapters, and inflator nozzles.