87P is a small portable compressor with a built-in LED work light, capable of inflating tires up to 31-inches. Simply attach the heavy duty battery clamps to your vehicle’s battery and start your engine. Connect the screw-on tire chuck to a tire valve stem before turning the unit on. Tire pressure can be monitored using the gauge located on the top of the unit.The 87P offers direct power connection to the battery allowing it to work with any vehicle regardless of the auxiliary power outlet rating.