Portable compressors with automatic shutoff come into play when moving from tire to tire, and when checking tire pressure in the middle of a tire fill. A typical portable compressor must be turned off between tire fills, and anytime you want to check tire pressure. If you aren’t near the compressor, this can turn into running laps back and forth to the portable compressor to turn the unit on and off. Automatic portables do not work in this fashion and will save you time & effort to get tires inflated quickly. Thermal Overload Protector Automatic Shut-Off Function Primary & Extension Air Hoses Vibration-Resistant Diamond-Plate Sand Tray Heat Shielded Quick Connect Coupling Gas Station-Style Tire Inflation Gun with 160 PSI Gauge Heavy Duty Dual Battery Clamps with Inline Fuse 45-Degree Extended Reach Chuck (For Dual Rear Wheels) 90-Degree Twist-On Chuck Heavy Duty Deluxe Carry Bag 3 pc. Inflation Tips KitSpecifications: 12-Volt Permanent Magnetic Motor Duty Cycle: 33% @ 100 PSI Max. Working Pressure: 150 PSI Ingress Protection Rating: IP54 Dimensions: 10.87