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Three small black microSD cards with three full-size SD adapters

Transcend

Transcend 256GB 300S UHS-I microSDXC 3-pack

SKU CH-E66W-489PA

Three 256GB microSDXC cards with UHS-I speeds up to 95MB/s read and 40MB/s write, V10 video class and included SD adapters

  • TypemicroSDXC
  • V10 speed class guarantees 10 MB/s minimum write for Full HD recording
  • Each card delivers up to 95 MB/s read and 40 MB/s write for fast transfers
  • Shockproof, waterproof, temperature-proof and X-ray-proof construction survives harsh environments
  • SD adapter included for use in standard SD card slots and readers
  • Three 256 GB cards expand storage across multiple devices

Three-card 256 GB bundle

This pack supplies three Transcend 300S microSDXC cards, each offering 256 GB of storage. They target photographers, drone pilots and mobile users who need multiple cards for extended shoots or separate devices. An SD adapter is included with every card for use in full-size slots.

UHS-I bus caps sustained write at 40 MB/s

The UHS-I interface limits maximum write throughput to 40 MB/s and read throughput to 95 MB/s. V30 and U3 ratings guarantee a minimum sustained write of 30 MB/s, enough for Full HD and 4K capture. In non-UHS-I hosts the card falls back to Class 10 or U1, dropping the guaranteed minimum to 10 MB/s.

Check for microSDXC slot and UHS-I support

Verify that your device accepts microSDXC cards and not only the older microSDHC limit. Confirm whether the host supports UHS-I to reach the 30 MB/s sustained write; otherwise expect the lower 10 MB/s floor. The bundled adapters add compatibility with standard SD slots.

Highlights

  • V10 speed class guarantees 10 MB/s minimum write for Full HD recording
  • Each card delivers up to 95 MB/s read and 40 MB/s write for fast transfers
  • Shockproof, waterproof, temperature-proof and X-ray-proof construction survives harsh environments
  • SD adapter included for use in standard SD card slots and readers
  • Three 256 GB cards expand storage across multiple devices

Specifications

TypemicroSDXC

Questions about this item

Should I buy the single card or the 3-pack?

The 3-pack gives you three 256 GB cards, each with an SD adapter, so you can equip multiple devices or keep spares.

What does the 95 MB/s read speed mean for daily use?

Apps and files open quickly because the card can read at up to 95 MB/s, while sustained writes reach 40 MB/s.

How does the UHS-I bus limit performance?

The UHS-I interface caps the card at 95 MB/s read and 40 MB/s write, matching the rated speeds.

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