4.8A 24W Dual USB Car Charger Volt Meter Car Battery Monitor with LED Voltage & Amps Display, Cigarette Lighter Adapter, Compatible with iPhone 15 Pro Max Plus 14 Samsung Galaxy S24 iPad Pro

I originally bought this item in the blue-colored display, as I favored that color. I bought it to use in our aircraft, hoping that it would be able to keep my iPad Pro 10.5 (with bluetooth, wi-fi, and cellular capabilities) fully charged during use of the iPad as a backup device that displays navigation, traffic, and weather while inflight. I LOVE the capabilities of the iPad for aviation use, but on sunny days at full display brightness, other chargers I have used could not keep it charged. That meant that, on long flights, I was always concerned about the battery dying and losing those tremendous backup capabilities. Well, the Jebsens charger was absolutely up to the task, never allowing the battery in my iPad Pro to drop below about 95%, usually keeping it at 100%. When flying with another pilot friend, it also kept his iPad just as fully charged at the same time as mine... FANTASTIC!!! In addition, it also provides a digital LED display accurately showing the aircraft's charging system voltage, which is a real plus considering the rather poor performance of the analog gauges on most legacy general aviation aircraft. I know that it is accurate because I checked it against two other very high quality voltmeters from different electrical test equipment manufacturers whose displays always agree to within hundredth of a volt, and the Jebsens unit was never off by more than .1 volts from the other two. It also displays the charging rate for any device to which you have it connected to quickly let you know that status. However, although I was tremendously pleased with its charging performance and system voltage display capability, the light intensity of the blue display was incredibly weak, making that display virtually unreadable in any daylight. I hoped it was just a fluke, and that I simply got a unit with an abnormally weak display. I contacted Jebsens about the problem, asking if what I was experiencing was normal and, if not, could I possibly exchange it for another unit. I also asked that, If the weak display was normal, could I exchange the blue display unit for a unit with the red-orange display, hoping that it would be brighter. They responded very quickly, basically telling me that the blue display was weaker, and that they would definitely send me a replacement unit with the red-orange display at no cost, and that I could just keep the original unit as well. What GREAT customer service!!! When I got the replacement unit with the red-orange display, I found that it performed just as well as the blue display unit, but that the intensity of the display seemed about three times as bright as the blue unit. In extremely bright sunlight it is still a wee bit of a challenge to read it, but it is more than acceptable. I have been SO happy with the replacement red-orange display unit that I just bought another one to give to my pilot buddy who had used mine along with me previously. I am also using the original blue unit in my Toyota 4Runner that is my off-roading, trailer towing, vacation vehicle. With its heavily tinted windows, the blue display unit is at least usable. So, if you intend to use one of these chargers during the day, I would STRONGLY RECOMMEND buying the red-orange display unit. However, no matter which one you choose, you'll get GREAT performance from a GREAT, responsive Seller, at a GREAT price when considering its capabilities... especially keeping high-draw electronics very well charged in your aircraft, boat, or road or off-road vehicle.

Great product. LED voltage display works great. 25w usb outs charge your devices fast.

I purchased this item because my Subaru Forester does not have a voltmeter in the gage cluster. This item expands my USB outlets and allows me to see the voltage of the battery or electrical system. I bought the one with the red display because other reviews noted that the red display was brighter than the blue one. I found that the red display is good but not overly bright. It works well. The voltmeter function worked down to 5.5 VDC . Compared to a calibrated voltmeter, the voltage displayed was within .2 VDC from 5.5 to 15 VDC, accurate enough for general use in a car. When a USB load is applied, the display alternates between the voltage and current and appeared to be accurate. I liked this item enough to order another one. When it came, I found that it had the blue display! The box showed the blue display, but the P/N sticker that was applied said it was red. No worry, I will keep it. The blue display is not quite as bright as the red to my eyes and it works well. Take your pick of the colors! Nice item for the price.

Jebsens 4.8A 24W Dual USB Car Charger Volt Meter Car Battery Monitor with LED Voltage & Amps Display, for iPhone 7 / 6s / Plus, iPad Pro/Air 2 / Mini, Galaxy S7 / S6 / Edge/Plus, Note 5/4, Visit the JEBSENS Store. This combination car battery voltmeter, and two USB charging slots, is a handy and well-made gadget. You can check the amount of voltage currently stored in your car battery, before you start the car, to see if the battery is run down or worn out. You can also check the amount of voltage in the battery while the car is running, to see if the battery is accepting a charge from the car alternator, and also to check if the alternator is working correctly, or if the drive belt to the alternator is stretched or slipping because the belt is worn out or broken. If you drive the car for 20 miles, and while the car is running, the battery is not showing 13+ volts, the alternator or fan belt may be worn out. Even after shutting off the car engine, the meter should show 12.1+ volts. If not, the battery is not holding a charge, and probably needs to be replaced. I have a seldom used second car in a garage, and I plan to add a charger/maintainer to it to keep the battery charged. The charger/maintainer must detect a residual battery charge of 2 volts in order for the charger/maintainer to charge the battery. If the battery is completely dead, I will use a jumper battery to get the car started, let the car idle for an hour to recharge the battery, then shut off the engine and plug the charger/maintainer into an 110Volt AC outlet to keep the battery charged while the car is in storage. The Jebsens Volt Meter LED display is a dark blue, and the small volt meter gets hidden under the car dashboard, with both things making it hard to see. For that reason, I can only give Four Amazon Stars to this Jebsens car battery voltmeter with two USB ports.