Jump Starter with Air Compressor 4000A Portable Car Battery Booster 4-in-1 Car Battery Jump Starter Box 8 5L

I had to use the booster 2 days after I received it and it was so simple and easy to use. This is worth the purchase. Read more

Tested this thing by pumping up my bike tires from flat and topping off the pressure on my car tires as well with no issues. The compressor is not absurdly loud and seems reasonably efficient at moving air. The hose clamped on snugly both on my bike and car tires with no noticeable leaks. The flashlight is also bright enough to use as an emergency/work light, though the ergonomics of holding the whole unit for a long time certainly are not the best and a dedicated flashlight would be more optimal. It works fine as a power bank too: will power your depleted phone in a pinch, just don't expect super fast charging out of it. Note that only the usb A port is for charging output since the usb C seems to only be an input for charging the jump starter itself. The interface is fairly straightforward and should be easy enough to navigate even if you forgot where you put the user manual in a roadside emergency. The semi-hard case it comes with also feels reasonably durable, with good zippers, and a strap for carrying/hanging. The jumper cable has some basic built in protections against polarity reversal and in my synthetic tests had no problems starting small gasoline v4 engines with a dead battery. It does seem to deliver power in bursts of some sort (with a relay or something clicking on and off). Not sure if that is intended operation or a side effect of my test setup, but I guess it would make sense considering how compact this thing is that it can not sustain high power for more than a few seconds, and that should be enough to start anyway on a reasonably light engine. Do note the compass on this thing does not work. Maybe I just got a defective unit or something, but the one on mine just freely rotates in whatever direction and does not align with the magnetic field. Overall seems like a decent combo unit for most light vehicles, though feels a bit on the flimsy side in a few places. Will update if it breaks on me within a year or so, but if durability proves to be good, this thing is reasonable value for money. Read more

I wanted something to keep in my car for emergencies, and this fits the bill perfectly. It comes with everything you need right in the box—no hunting for extra adapters or cables. The instructions are straightforward, and the menu on the screen is easy to follow. It’s simple enough that anyone in my family could use it if they got stuck. For what you pay, it’s a complete and dependable setup. Read more

I keep this in the back of my SUV for road trips, and it already paid for itself. My truck battery died at a trailhead, and this thing started it instantly—no struggling at all. The air compressor is also a beast for filling up tires after airing down on dirt roads. It feels solid and well-built. Read more

This multi function jump box has great potential! I have not tried using it to start my vehicle, as the need has not arisen. But I have tested out all the other functions of this nifty gadget. It has a digital display is easy to read, and the LED flashlight is super bright, and can be set in SOS mode for emergencies. This power box can be used as a power bank, making it easy to charge phones, tablets, etc. The air compressor function works nicely, but when setting it in this mode you need to switch it so the display reads out for PSI. Its default setting is BAR, and I had no idea what that was until I looked it up. Too confusing. I’ve never been anywhere that has an air compressor that displayed BAR. And when the unit is turned off, it resets back to BAR. It would be better if it would remain on the last used setting. Additionally, it has different nozzles to allow you to inflate sporting equipment (basketballs, footballs, soccer balls, etc). The jump box and its accessories are lightweight and fit neatly into the included carry case. The case is small enough to tuck into a corner in the trunk of your car or fit under the seat. I would suggest checking it every now and then to make sure it’s still holding its charge. Otherwise it may be useless in a true emergency. Overall, I think this is a great tool to own. It’s something I’m glad to have in an emergency, but also something I hope I won’t ever really need to use! Read more

This is a great little tool for my daughter who just started driving this year. The Air Compressor works fantastic on car tires and as a basketball or bike tire pump. I have used other ones that don't always adhere to the PSI limits you set it at, but this one shut of perfectly when I added the pressure for a basketball and then a car tire. The jump start works well if you have just left your lights on or don't need to start it from completely dead. The case is really nice, and it fits easily in the trunk of her Chevy Cruz without taking much time. Read more