●1.EASY TO USE: Preset the Air Deflators to Your Desired Pressure Between 6-30PSI, and Simply Screw the Automatic Air Deflators One by One on the Standard Schrader Valve Stem to Start Deflating and You can Enjoy the Beautiful Scenery Along , They Will Shut off at the PSI you Set up. Twist Them off and Start the Off-Road.Stocking Stuffers for Men and Women(Factory Preset :18PSI) ●2.QUICKlY AND ACCURACY:Preset Designed Deflators Rapidly Air down the Four Tires Pressure without Removing the Valve Core, No Abrasion of the Valve Core and No Risking losing it. ●3.HEAVY DUTY AND BULIT TO LAST:No Batteries, Durable Brass Construction Four 100% Solid Brass Deflators can Suitable for Most Weather and Conditons During Off- Road Experience ●4.PERFECT for ANY VEHICLE:4 Tire Deflators Come in a EVA Boxes Suitable for Jeep,Truck, ATV with Schrader Valve, Once finish using Easy for Storage ●5.LIFETIME FRIENDLY CUSTOMER SUPPORT,Buy with Confidence,Save a Fortune with Improved Gas Mileage,and Enjoy a Smoother and Safer Driving Experience, Also A Great Choice for Your Off- Road Driving