The microSD card's tiny size, about 38 percent of the (surface area) size of a miniSD card and a mere 21 percent of the (surface area) size of a regular SD card, is designed for use in cellular phones with memory-hungry multimedia features such as music players and built-in digital cameras.

The microSD card is for use in devices equipped with microSD slots. The card can utilize the provided adapter that converts the microSD card into a regular-sized SD card, allowing the microSD to be used with other regular SD-compatible devices, such as digital cameras, MP3 players, and handheld computers. The adapter is also convenient for using a microSD card in card readers that accept SD cards but not microSD cards.
At its release, the microSD card is the smallest memory card with worldwide availability.

MPN: CT4GBUSDHC
UPC: 649528740441

• Note: Secure Digital High Capacity (SDHC) cards are designed for use in SDHC-enabled devices and are not backwards compatible with standard SD legacy devices.
  
• Card Size: 4GB
  
• Card Type: microSD
  
• Dimensions: .4331" wide, .5906" high, .03937" thick (11 mm x 15 mm x 1 mm)
  
• Weight: .4 grams
  
• Compatibility: Meets SD Specs
  
• Regulatory Compliance: CE, FCC
  
• Features: Adapter Included for use in SD applications
  
• Warranty: Lifetime Warranty