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Kingston MobileLite G4 USB 3.0 Memory Card Reader FCR-MLG4

Kingston MobileLite G4 Card Reader


The Kingston MobileLite G4 is a compact USB 3.0 reader/writer for SD and microSD cards. It supports UHS-I and UHS-II SD cards. It also has a dedicated microSD/microSDHC/microSDXC slot that supports UHS-I. UHS-II is the new SD Version 4.0 specification that uses a second row of pins. On full size SD cards this means a total of 17 contacts. These extra contacts are located in a second row behind the standard row of nine contacts to allow reverse compatibility.

Toshiba Exceria Pro UHS-II 32GB SDHC Memory Card Back

The metal exterior of the MobileLite G4 provides a modern appearance and is substantial enough to provide some durability. Its body and plug appear to be formed from a single piece of metal.

Kingston MobileLite G4 Card Reader with SD Card

The reader fits snugly in the USB port and cards slide smoothly and easily into and out of the reader. The result is you can insert and remove cards with one hand without touching the reader, something we were not able to do with the side-loading Transcend RDF5. When fully inserted, the SD card protrudes 5/16 inch (8mm) from the end of the reader as shown in the photo above.

Kingston MobileLite G4 Card Reader Top

The body of the G4 reader overhangs the USB plug by about 3/8-inch (10mm) to each side which could possibly block adjacent USB or other slots depending on their orientation. However, the 9mm height of the reader makes it short enough to clear most ports positioned above or below it.

Unlike most readers we tested, the G4 has no card access light. At first glace, holes on each corner might appear conceal a light, but these holes appear to be intended to attach a key chain or strap using a string or wire (not included).


The MobileLite G4 attained some of the highest sequential read speeds for many of the UHS-I SD cards tested. Sequential read speed is the most important benchmark for a card reader used in a digital photography workflow where large files will be transferred in series. Read speeds of UHS-II SD cards were not quite as fast as those seen using Lexar UHS-II readers, but still significantly faster than UHS-I.

It should be noted that only the full size slot supports UHS-II. When UHS-II microSD cards are tested, they are used in a UHS-II microSD to SD card adapter to attain the highest benchmarks. When UHS-II microSD cards are used directly in the microSD slot, they revert to UHS-I speed (up to 104MB/s).

Reader: Kingston MobileLite G4 UHS-II
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 8.1 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600

Kingston MobileLite G4 UHS-II
Card Benchmarks
Toshiba Exceria Pro UHS-II 32GB248.272216.536
Lexar Professional 2000x UHS-II 32GB243.883229.775
Transcend Ultimate UHS-II U3 64GB241.080173.692
Lexar Professional 2000x UHS-II 64GB239.839226.425
Sony M Series UHS-II 64GB239.83998.913
SanDisk Extreme Pro 280MB/s UHS-II 32GB239.675202.623
Panasonic MicroP2 UHS-II 32GB239.64749.056
Transcend Ultimate UHS-II U3 32GB239.346175.832
Delkin 1900x UHS-II 32GB238.91050.949
Lexar Professional 1800x microSD UHS-II 32GB237.934201.301
SanDisk Extreme Pro UHS-II 275MB/s microSDXC 64GB234.896105.385
Lexar Professional 1000x UHS-II 32GB154.02188.071
Lexar Professional 1000x UHS-II 64GB152.67683.772
Lexar Professional 1000x UHS-II 128GB152.01286.367
Lexar Professional 1000x microSD UHS-II 32GB150.87452.671
SanDisk Extreme Pro 95MB/s 64GB98.46792.434
SanDisk Extreme Pro 95MB/s 32GB98.43991.284
SanDisk Extreme Plus 80MB/s microSD 32GB98.43065.434
SanDisk Ultra 80MB/s microSD 128GB97.92557.987
SanDisk Extreme Plus 95/90 MB/s microSD 64GB97.87991.355
SanDisk Extreme Plus 80MB/s 64GB97.87060.232
SanDisk Extreme 90MB/s U3 32GB97.87049.192
SanDisk Extreme Pro 95MB/s 128GB97.76091.459
SanDisk Extreme 90MB/s U3 64GB97.67849.602
SanDisk Extreme 90MB/s microSDXC 128GB97.65164.354
SanDisk Extreme Pro 95MB/s microSDXC 64GB97.60691.411
SanDisk Ultra 80MB/s microSD 64GB97.50620.171
Kingston U3 90/80 MB/s 64GB97.49786.788
SanDisk Extreme Pro 95MB/s microSDHC 32GB97.48891.181
Kingston Class 10 UHS-I 64GB97.46071.235
SanDisk Extreme Plus 80MB/s 32GB97.44259.548
SanDisk Extreme 90MB/s U3 V30 256GB97.39764.907
SanDisk Extreme 90MB/s microSDHC 32GB97.38848.424
Kingston U3 90/80 MB/s 32GB97.33490.699
SanDisk Extreme Pro 95MB/s U3 32GB97.12690.825
PNY Pro Elite microSDXC 64GB97.10887.740
Toshiba Exceria Type 2 32GB97.05465.898
Toshiba Exceria Type 1 32GB97.05487.828
SanDisk Extreme Plus 95/90 MB/s microSD 32GB97.01990.637
SanDisk Extreme Pro 95MB/s 256GB96.94790.309
Patriot EP Series microSDXC 64GB96.80489.393
Panasonic Gold 95/90 64GB96.69688.227
Toshiba Exceria UHS-I Class 3 64GB96.65259.860
Toshiba Exceria UHS-I Class 3 32GB96.58161.335
Patriot EP PRO microSDXC 64GB96.52786.781
SanDisk Extreme Plus 90MB/s 32GB96.51071.879
Kingston U3 (90/80) microSD 64GB96.45684.338
Lexar Professional 633x U3 256GB96.40366.248
Samsung EVO Select microSDXC 64GB96.24425.455
Delkin Elite 633x 32GB96.21781.856
Samsung EVO Select microSDXC 256GB96.12987.740
Delkin Black 32GB95.96281.380
Samsung PRO microSDXC 64GB95.93679.174
Transcend R95 W85 U3 64GB95.92788.264
Samsung PRO Plus 64GB95.92788.027
Samsung PRO Plus 32GB95.91887.498
Samsung PRO Plus microSDXC 64GB95.91887.149
PNY Elite Performance 90MB/s 32GB95.85738.402
Samsung PRO U3 64GB95.83979.156
Samsung PRO U3 32GB95.82280.093
PNY Pro Elite 64GB95.77885.942
PNY Elite Performance 64GB95.76966.420
Transcend 95/60 MB/s U3 64GB95.76966.374
Patriot EP Pro 90MB/s 64GB95.72542.149
Samsung PRO Select microSDXC 64GB95.71787.505
Transcend 600x 32GB95.70839.361
Sony 94MB/s 32GB95.69966.985
Sony 95MB/s U3 64GB95.68288.390
Lexar Professional 600x 64GB95.68267.681
Patriot EP Pro 90MB/s 32GB95.67347.554
Transcend 95/85 MB/s U3 32GB95.60388.742
Sony 95MB/s U3 32GB95.60388.249
Kingston Ultimate 32GB95.38647.140
Lexar Professional 600x 32GB95.21348.505
PNY Elite Performance U3 128GB95.16968.687
Samsung PRO 32GB95.14382.708
Transcend 633x microSDHC 32GB95.09288.086
Patriot EP Pro 128GB95.04042.577
PNY Elite-X microSDHC 32GB94.99776.785
Transcend 600x 64GB94.99767.389
Panasonic Gold Series 32GB94.98043.535
Transcend 95/60 MB/s U3 128GB94.96368.205
Gobe Magic 104MB/s 32GB94.96388.138
Lexar Professional 633x U1 128GB94.89428.960
PNY Turbo Performance U3 microSD 32GB94.89456.800
PNY Elite microSDXC 128GB94.79928.068
PNY Elite Performance U3 256GB94.76556.305
Gobe Magic 104MB/s 64GB94.73987.747
PNY Turbo Performance microSDXC 64GB94.69759.128
Lexar Professional 633x U1 64GB94.62028.216
Samsung PRO 64GB94.62083.359
Lexar Professional 633x U3 64GB94.57769.031
PNY Elite-X microSDXC 64GB94.49274.267
Lexar Professional 633x U1 32GB94.45822.047
Transcend Ultimate 633x microSD 64GB94.26286.631
SanDisk Extreme Plus 90MB/s 64GB94.08570.874
Lexar Professional 633x U3 32GB93.90048.583
Lexar Professional 633x U3 128GB93.14968.674
Samsung PRO Select microSDXC 128GB93.05084.318
Samsung PRO Plus microSDXC 128GB92.81983.699
SanDisk Extreme 90MB/s microSDXC 64GB92.75343.713
SanDisk Ultra 90MB/s microSD 200GB90.73918.566
Lexar Professional 633x microSDXC 200GB90.47236.967
Samsung EVO Plus 128GB microSDXC87.66622.520
SanDisk Extreme 90MB/s U3 128GB85.11978.118
SanDisk Extreme 80MB/s 128GB84.20979.522
Lexar Professional 633x microSDXC 128GB82.70223.226
SanDisk Ultra (80MB/s) microSD 32GB82.48717.990
SanDisk Extreme 80MB/s 256GB81.76778.728
Samsung EVO Select microSDXC 128GB81.03421.944
SanDisk Extreme 60MB/s 32GB75.31354.744
SanDisk Extreme U3 microSD 32GB74.69054.229
Lexar Professional 400x 32GB71.66843.669
SanDisk Extreme 60MB/s 64GB70.97452.494
SanDisk Extreme U3 microSD 64GB68.06356.044
PNY Elite microSDXC 64GB55.55732.263
Lexar Professional 633x microSDXC 64GB55.34028.131
SanDisk Ultra 40MB/s 64GB47.74115.563
SanDisk Ultra 40MB/s 32GB Card 147.73844.969
SanDisk Extreme 45MB/s 32GB47.70444.817
SanDisk Ultra microSD 32GB47.69914.650
SanDisk Ultra microSD 64GB47.69915.974
Samsung EVO microSD 32GB47.59524.490
Samsung EVO microSDXC 64GB47.53123.625
Samsung EVO 64GB47.49423.786
Samsung EVO 32GB47.19119.899
SanDisk Ultra 40MB/s 32GB Card 347.18419.719
SanDisk Ultra 40MB/s 32GB Card 247.18419.813
Toshiba NFC 16GB37.84913.117
Toshiba FlashAir II 32GB19.10213.047

Using UHS-I cards, the highest read speed recorded using MobileLite G4 was the SanDisk Extreme Pro 95MB/s 64GB UHS-I SDXC card which reached 98.5 MB/s read. The highest UHS-II speed was achieved using the Toshiba Exceria Pro 32GB UHS-II card which reached 248.3 MB/s read speed. UHS-II cards provide an obvious speed advantage when downloading images.


The MobileLite G4 is relatively inexpensive, durable and fast. It recorded some of the highest UHS-I speeds with nearly every card tested. Its metal exterior provides a solid feel and overall build quality is high. If you want a compact card reader, the MobileLite G4 should be a top consideration.

The G4 reader is compatible with Windows Vista (SP1, SP2), 7 (SP1), 8 and 8.1 as well as Max OS X v 10.6.x+ and Linux c 2.6+. The reader has a 2 year warranty. Assembled in China.

Compare prices on the Kingston MobileLite G4. The lowest prices are highlighted in the table below.

Card ReaderConnectionModel NumberPrices
AmazonB&H PhotoAdorama
Kingston MobileLite G4 UHS-IIUSB 3.0FCR-MLG4Check price $8.95$8.95