Cordless Tire Inflator, UNTIMATY Portable Air Compressor, 150PSI Handheld Air Pump with 21V Rechargeable Battery, Digital Pressure Gauge for Cars Motorcycles

Instructions could be better on short press or long press of the main buttons. Long press of the center button turns on and off the main screen, and short press the center button to turn the compressor on or off with the trigger button. The battery charger light turns from red to green when it is fully charged. A button on the front of the battery shows the charge state also. The main cause of battery and compressor failure is over-heating. There is a ball inflator needle, an air bed inflator attachment and an adapter for racing bike tall valve stem tube inflation. A 12 volt cord is included, so the compressor runs on 12 or 20 volts.

I am overall pleased with this compressor. It is easy to use, portable and well built. It is excellent for for topping up pressures say 5 to 10 psi on 4 tires. If you are looking flat to say 30psi it will not handle 4 tires in one charge. For the price it is excellent for bicycle, golf cart, and car but it is NOT a professional mains driven air compressor.

Pump works fast, much faster than my old one did when it was new. Comes with everything you need. Just put the battery on it and you're ready to go. Advise fully charging battery first. It reads full when you test it out of the box but it's just a surface charge.

it took me a minute to figure out how to use it. you attach to your car tire %26 it will read the current pressure. you can then set it to the pressure you want it at %26 you click "the trigger" %26 off it goes. Filled all 4 tires %26 the rechargeable battery is still full. finally, the warning light on my dash turned off!

Shipping was super fast - arrived next day. I'm quite impressed with it so far. Very simple to use - just push the plus sign until you reach the pressure you want the tire filled to, attach hose to tire, and push start. It will stop automatically. I put roughly 10-13lbs into each tire and it took about 3-5 minutes per tire. The battery did die after the third tire, but honestly, I wasn't expecting it to last that long. A few minutes on the charger and finished the last tire.

This unit airs my tires up a lot faster than my old unit. It is well constructed and looks to be very durable and should also last longer than my old one.

I bought this cordless tire inflator for my husband because he complains DAILY that our sons take his tools, “borrow” them forever, or return them in a condition that looks like they used them to fix a tractor, wrestle a bear, and build a spaceship all in the same afternoon. So I figured this little air compressor would be his new pride and joy — something the boys couldn't steal because he'd probably sleep with it under his pillow. And honestly? I'm pretty darn pleased with it. It's lightweight, powerful, and simple enough that even my husband can use it without calling me over to read the directions (a Christmas miracle). The 21V battery lasts a good while, and the 150 PSI is no joke — it fills tires fast enough that he's actually impressed, which almost never happens unless food is involved. So overall, great product. Works well, easy to use, and most importantly… I haven't heard him complain about missing tools for at least three days. That alone makes it worth every penny.

For one the battery does not stay charged for long it comes charged it dies fast you charge it it dies fast also it says it basically has a double working pump I have bought one from in the store for $24 a portable inflator that works faster and better than this product which is supposedly $40 more than what I used to buy it's just not worth it looks are deceiving on this item

there is a lag in operation. the battery I received was not working and it looked like someone had been trying to proform some kind of work on the battery with maybe a Philips screwdriver.

I have used it twice and charged once . The second time I went to charge it and it would not charge . I received it and the battery was damaged as in the picture- out of the box