Key Specifications/Special Features: 

Four big advantages: 
Holds two cards for super large capacity 
Get maximum storage capacity with two microSD HC or two microSD cards 
Converts two microSD (HC) cards into one MS pro duo stick 
You can get twice the capacity at a lower price 
Cards type can be mixed: 
Cards of different capacity and different type can be used concurrently (for example, microSD and microSD HC) 
Freedom of expansion and upgrade: 
The adapter works with only one microSD HC card as well 
The second slot can be equipped anytime later 
You can exchange the cards and upgrade the maximum capacity at will 
Super high read/write speeds of 10Mbps and up: 
This dual slot adapter is made of high-quality components and preserves the original speed of the inserted microSD (HC) cards (when two different types of microSD (HC) cards are used, the slower card sets the speed rate) 
Product description: 
Supports two microSD/microSD HC cards 
Two microSD (HC) cards of different capacity can be used 
If only one microSD (HC) card is used, it must be inserted into slot #1 in order to work 
When using new microSD (HC) cards, you need to format with a Sony product before you can store data 
In order to copy or delete data directly, insert the adapter in your card reader 
Don't take out the microSD (HC) cards and perform write operations on the single card 
Your data will be corrupt 
Product specification: 
Supported card types: microSD 256MB to 2GB and microSD HC 4 to 16GB 
Maximum capacity: depends on the capacity of used microSD/microSD HC 
Operation temperature: 0 to 70 C 
Storage temperature: -25 to +85 C 
Humidity tolerance: 95% (maximum) 
System requirements: works on all OS (PSP/Windows/Mac) 
Dimensions: 31.1 x 20.0 x 1.6mm 
Weight: 2g