The Lexar 1066x 256GB microSDXC Memory Card is a professional-tier microSDXC card built for demanding capture devices. At 160MB/s read and 120MB/s write, it exceeds the UHS-I 104MB/s specification through Lexar’s engineered interface — fast enough to keep pace with action cameras shooting continuous 4K, drones recording high-bitrate footage, and smartphones capturing RAW. 256GB eliminates the memory anxiety of extended shoots. A2 rating means apps load quickly on compatible Android devices. This is the card for creators who can’t afford dropped frames or failed writes.
Speed
160MB/s Read · 120MB/s Write
1066x (160MB/s) exceeds the standard UHS-I ceiling of 104MB/s through Lexar’s engineered bus technology — note that achieving full 160MB/s read requires a compatible UHS-I reader. Write speed of 120MB/s handles continuous 4K recording without buffer overflow. V30 guarantees a minimum sustained 30MB/s write — the threshold required for reliable 4K video. U3 confirms the same minimum. This is meaningfully faster than standard V30/U3 cards, which often only just meet that floor.
Capacity
256GB — Shoot Without Limits
256GB holds approximately 40–50 hours of Full HD video, or 10–15 hours of 4K footage depending on bitrate and codec. For a drone pilot shooting a full day of 4K landscape footage, or an action camera operator recording across multiple sessions, 256GB means carrying one card and not thinking about storage. For smartphone users, it also provides A2-rated app performance — load speeds noticeably faster than A1 or unrated cards.
Durability
Built for the Field
Tested for water resistance, shock (drop), vibration and X-ray exposure protection. Operating temperature range of -25°C to 85°C covers most real-world outdoor conditions. Lexar’s Quality Labs tests cards against more than 1,100 digital devices for compatibility and reliability. The included SD adapter is separately tested and covered by a one-year warranty, while the card itself carries Lexar’s lifetime limited warranty.
Great choice if you…
✔ Shoot 4K video on an action camera, drone or mirrorless
✔ Need maximum capacity for all-day or multi-session shooting
✔ Use a Nintendo Switch and want fast loading + large storage
✔ Run apps from microSD on an Android device (A2 rated)
✔ Need professional-grade durability in outdoor conditions
Consider something else if…
✖ 256GB is more than you need — 64GB or 128GB versions cost less
✖ You need a dash cam or CCTV card — see Lexar High Endurance instead
✖ Your device uses SD or CFexpress format
Technical Specifications
| Brand / Series | Lexar Professional 1066x (Silver Series) |
| Capacity | 256GB |
| Format | microSDXC |
| Max Read Speed | Up to 160MB/s (1066x) |
| Max Write Speed | Up to 120MB/s |
| Speed Class | Class 10 · UHS-I · U3 · V30 · A2 |
| Video Support | 4K UHD + Full HD 1080p |
| Operating Temp | -25°C to 85°C |
| Durability | Water · shock · vibration · X-ray proof |
| Dimensions | 15 × 11 × 1mm |
| Warranty | Lifetime limited (Lexar) · Adapter: 1 year |
Box Contents
Lexar Professional 1066x 256GB microSDXC card
microSD to SD adapter
Compatible With
Action cameras — GoPro, DJI Osmo, Insta360
Drones — DJI Mini, Air and Mavic series
Nintendo Switch / Switch OLED / Switch Lite
Android smartphones & tablets (A2)
Any microSDXC UHS-I compatible device
Condition
Brand New — Sealed Retail Packaging
Warranty
Lifetime Limited (Lexar) + 12 Months Seller
Delivery
4–5 Working Days · Fully Tracked
For continuous recording applications like dash cams and CCTV, see the Lexar High Endurance instead. Browse the full microSD card range at maibo.













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