Tires that are underinflated wear out more quickly and can make your vehicle more dangerous to drive. The advantage of the Black+Decker 20 V MAX inflater is its high-pressure output that speeds up the inflation process, compared to weaker units that require you to plug in to your car’s power receptacle. The V MAX also comes with a digital pressure gauge that shuts off the unit once the desired pressure has been reached. The lithium-ion batteries can be recharged using 120-volt household current or your vehicle’s 12-volt receptacle. The V MAX also inflates air mattresses, sports equipment, etc. Purchase for about $50 from a number of online resellers, including www.lowes.com and www.amazon.com.