microSD Card 170MB/s for 4K Video and Phone Storage
Shoot 4K on your phone or action cam without the stutter, and stop the storage warning from landing at the worst moment. This SanDisk Extreme PRO microSD carries printed V30, A2 and U3 ratings, with up to 170MB/s read speed. The SD adapter in the box covers full-size slots.
Read the full descriptionDescription
Shoot 4K on your phone or action cam without the stutter, and stop the storage warning from landing at the worst moment. This SanDisk Extreme PRO microSD carries printed V30, A2 and U3 ratings, with up to 170MB/s read speed. The SD adapter in the box covers full-size slots.
Up to 170MB/s read speed for fast transfers and reliable 4K recording
- slow file transfers
- dropped frames when recording 4K video
- slow app loading on phones and cameras
Record 4K on the go without the stutter
Stop losing shots to a slow card and a full phone. Up to 170MB/s read and V30 write speed keep your footage and apps moving.
Three ratings that tell you what this card can do

Sustained 4K recording
V30 is the video speed class printed on this card. It sets a minimum for sustained writes, so the card keeps pace while a 4K clip records instead of relying on a peak number that only shows up in short bursts.

Faster transfers to your phone
Up to 170MB/s read speed means clips and photos leave the card quickly. Pair it with an apple sd reader for a straightforward offload after a long shoot.

Apps that open quicker
A2 is the rating for apps that run from the card. Its random read and write performance matters when a phone keeps apps and cache on microSD, so launches and menus feel less sluggish.
Printed numbers you can check yourself
- 170MB/sUp to read speed
- 90MB/sWrite speed printed on the back
- 128GBLargest capacity option, 64GB also available
Format it once, then shoot with confidence
- 1Seat it in the adapter
For full-size SD slots, slide the microSD card into the included adapter until it locks.
- 2Insert and format
Put the card in your phone or camera, then format it in device settings so the system sets up the file structure.
- 3Record a test clip
Set 4K recording and shoot a short clip to confirm it saves cleanly before a trip.
- 4Eject before removing
Eject the card through device settings or wait for saving to finish. Pulling it mid-write can corrupt the clip you just recorded.
A microSD card plus an SD adapter, ready to use
- SanDisk Extreme PRO microSD card×1
64GB or 128GB, depending on the variant you choose
- SD adapter×1
For full-size SD slots
What to expect after you insert it
- First useFormat and test it
Format the card in your phone or camera settings, then record a short 4K clip to confirm it saves cleanly. Most setups take only a few minutes.
- 3 usesMove clips and photos
Transfer files to your computer or phone and note how long offloading takes compared with your old card. Speed depends on your reader and device.
- 30 daysRun it as your main storage
Keep your 4K clips and apps on the card and watch for stalls during longer recordings. Back up important files regularly, as with any storage.
Why a rated card beats an unmarked one
| SanDisk Extreme PRO | Unrated budget microSD | |
|---|---|---|
| V30 video class printed | — | |
| A2 app performance rating | — | |
| Read and write speeds printed | — | |
| SD adapter in the box | — | |
| U3 and Class 10 markings | Varies |
Characteristics
Reviews
Questions and answers
The card is labelled for Android smartphones and action cameras, and it supports 4K video recording and playback. Check that your device accepts microSDXC cards, since that is the format used here.
Yes, the SD adapter is in the box. A plain microSD slot takes the card directly. Use the adapter for full-size SD slots, such as laptop or camera readers.
V30 is the video speed class printed on the card. It is a rating for sustained video writes, which is what keeps a 4K clip from dropping frames during a long take. It is more useful than a peak speed number for filming.
A generic card with no ratings gives you no way to check whether it will hold a 4K take. One ruined clip costs more than the upgrade. This card also includes the SD adapter, so you do not need to buy one separately, and one card covers phone storage, camera recording and full-size slots.
Up to 170MB/s is a read speed printed on the packaging and the card, so treat it as the top of the range. Real transfer speed depends on your card reader and device. The V30, A2 and U3 markings on the back are the ratings to verify.
Similar products
See all







