Product info：

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Key Specifications/Special Features:
Description:Write-protect switch¡BConvenient
Interface:SD
Capacity:256MB~2GB
Write Protect:YES
Power Supply:2.7 ~ 3.6V
Dimensions:32 x 24 x 2.1 mm (1.26 x 0.94 x 0.08 in)
Other Information:
The advertised memory capacity of this device represents unformatted capacity. Please note that once formatted and due to variations in flash module block limitations, the functional storage space will be lower than the advertised capacity