Kingston MobileLite G4 Review

Kingston MobileLite G4 Review

I recently ran into an issue when I bought my new laptop. It seems that most new laptops have dropped built-in SD memory card readers. They have completely swapped them for Micro SD versions instead. And that has turned into a problem as I have a bunch of SD cards. Which lead me to purchasing the Kingston MobileLite G4 memory card reader. It's an incredibly compact device that combines both of the SD versions. So not only is it versatile but it's also very well prices. You can read more about my thoughts in the review below!

Technical Specification

  • Dimensions: 52×33×9 mm / 2.0×1.3×0.4″
  • Weight: 16 g / 0.56 oz
  • Speed rating: UHS-I and UHS-II
  • Slots: SD, Micro SD
  • Connection: USB 3.0


Out of all the memory card readers I have used before, the Kingston MobileLite G4 is definitely the smallest and most compact. It has a dimension of 52×33×9 mm / 2.0×1.3×0.4″ and weighs only 16 g / 0.56 oz. Which is perfect as you won't have any problems storing it. You can even throw it in a laptop bag if you are often on the go. Plus you don't need to worry about it breaking apart. The card reader is made out of stainless steel. And the USB connector is also covered by the same stainless steel body so it's extremely durable. The only part that's plastic is the slot area.

Kingston MobileLite G4 SD

As you can see it has a really simple and smooth design. The front side has Kingston engraved into the stainless steel body. I have called it the front side because it's the side that stays on top when you plug it into the USB port. Oh yeah and it's the side with the SD card slot as well.

Kingston MobileLite G4 MicroSD

The opposite side has the model, MobileLite G4, engraved into it. It's also the side with the Micro SD card slot. So yes, it has seperate slots for both SD and Micro SD cards. I really like this solution as you don't need to use any adapters. Really convenient and simple.

So overall the Kingston MobileLite G4 has extremely high build quality and a unique compact design.


It's pretty hard to judge memory card readers in terms of performance. There's a lot of things that can affect both the read and write speeds. Most importantly the memory card you are using. The Kingston MobileLite G4 has a USB 3.0 connector, which is more than fast enough to handle even the fastest consumer grade card speeds.

Kingston MobileLite G4 USB

According to the technical data, a USB 3.0 has a maximum transfer speed of 640 MB/s. And according to the readers specifications, it's rated for UHS-I and UHS-II memory cards. Which is definitely up to date according to todays standards and more than capable of reacing those. Especially since the fastest SDXC UHS-II card supports 312 MB/s. So let's see if it's possible to reach the speeds written on the cards with this reader.

I do want to point out though that the Micro SD slot only supports UHS-I. So even if you use a UHS-II card, it will still revert to UHS-I speed, which is up to 104 MB/s. It is still possible to use the SD card slot as well but then you need to use an adapter.

So I decided to run a test with the Toshiba Exceria Pro UHS-II SDHC card. It has a maximum theoretical read speed of 260 MB/s and write speed of 240 MB/s. And here are my results from transferring a 3.92 GB file from and to the memory card.

  • Sequential read speed: 249.4 MB/s
  • Sequential write speed: 218.5 MB/s

Both of the speeds are pretty close to the theoretical values mentioned in the technical specs. And that's actually really good considering that it's a consumer grade device and not exactly designed for professionals!


If you are looking for a fantastic USB 3.0 memory card reader, then the Kingston MobileLite G4 is the one for you! Not only is it extremely well priced and compact but it also one of the fastest available readers for consumers! Plus of course the stainless steel design looks super nice as well.