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Samsung PRO Endurance microSDXC Memory Card

Class 10, UHS Speed Class 3 (256GB)

Item # 305MJ256KA

Item # 305MJ256KA

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$54.99 -$5.00 Instant savings


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Product highlights:

  • 256GB capacity
  • UHS-1 interface
  • supported speed classes:
    • UHS Speed Class 3
    • Video Speed Class V30 (certifies high minimum speed for video)
    • Speed Class: 10
  • read speed: 100MB/s
  • write speed: 40MB/s
  • durable waterproof, X-ray-proof, magnet-proof, and drop-proof design makes it reliable for surveillance cams, dash cams, and body cams
  • endures temperatures from -13° to 185°F
  • tested against wearing out for approximately 140,160 hours of use
  • includes full-size SD card adapter
  • warranty: 5 years card (1 year adapter)
  • Our 60-day money-back guarantee
  • MFR # MB-MJ256KA/AM

What's in the box:

  • 256 GB microSDHC memory card
  • SD adapter for microSD

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Crutchfield response

<< >>

More details on the Samsung PRO Endurance microSDXC Memory Card

Mark G.

Product Research


Overview: The Samsung PRO Endurance microSDXC flash memory card lets you store your digital photos and videos, as well as your digital music files and documents. The memory card is compatible with microSDXC host devices, including most digital cameras and camcorders, drones, surveillance cameras, and smartphones with a microSD memory card slot. A full-size SD card adapter is included for use with SDXC-compatible devices. The card is backed by a 5-year limited warranty, while the adapter is covered for one year.

Speed Class Rating: This PRO Endurance microSDXC card has a Class 10 SD speed rating. The card also has a UHS-I interface and a UHS Speed Class rating of U3, making it a recommended medium for recording large, mega-pixel photos and 4K UHD video. It has a Video Speed Class rating of V30. It has a read speed of up to 100 MB/s and a write speed of up to 40 MB/s.

Usable Memory: A portion of the card's capacity is used for system files and maintenance. The actual usable capacity of this card is slightly less than the labeled capacity.

Durability: The Samsung microSDXC card's rugged construction makes the card able to withstand most any condition. It is resistant to the following:

  • Video Monitoring: up to 140,160 hours (equivalent to 16 years) of constant monitoring
  • Waterproof: withstand up to 72 hours in 1 meter depth of seawater
  • Temperature: operating temperatures of -25°C to 85°C (-13F° to 185°F); non operating temperatures of -40°C to 85°C (-40°F to 185°F)
  • X-Ray: up to 100mGy (equal to airport X-ray machines)
  • Magnetic Fields: up to 15,000 gauss for 30 seconds, or the magnetic field of a high-field MRI
  • Drop: withstands drops up to 5 meters (16.4 feet)
  • Wearout: up to 10,000 swipes

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