micro sd card maximum capacity

The listings show capacities from 32 GB up to 256 GB. The highest capacity shown is 256 GB.

Listings that call out Nintendo Switch compatibility show 128 GB and 256 GB capacities.

The results list Class 10, UHS Speed Class U3, and V30 video-speed ratings — all commonly cited for 4K-capable cards. Some listings also display the A1 application-performance class alongside those ratings.

Many listings describe the cards as waterproof, shockproof, x‑ray proof, and temperature resistant. One listing also shows a temperature range written as "-13 to 185" followed by garbled unit characters, so the intended units (°C or °F) are unclear and should be verified in the original product details.

A1 application-performance is called out on listings for 32 GB and 128 GB cards.

The listings explicitly mention 4K/Ultra HD support for cards shown at 32 GB, 128 GB, and 256 GB. (Note: this restates the listings' claims; check video-speed/class ratings such as U3 or V30 in the product details to confirm true 4K recording suitability.)