A PRO Duo Stick, also called Memory Stick PRO Duo is a kind of a memory stick with a flash memory card format that can be removed.  The PRO Duo stick is in fact a smaller version of the Memory Stick – both in form and factors. Sony first developed the PRO Duo stick. 

The features included are

- It is a Flash memory card, smaller and lighter than a standard-size Memory Stick card

- It has High-capacity data storage device

- The stick enables data transfer at high speeds

- Most PRO Duo sticks have MagicGate copyright protection technology that enables safe distribution of downloaded movies, music etc. 

- It is expensive

- It requires a certain range of temperature for operation

- It is extremely durable and reliable

Types

Types of PRO Stick Duos are based on whether they are:

• - with or without MagicGate support
• - with or without High Speed mode

Usage

The PRO Duo Stick, owing to its size, is used with the help of a simple adapter in all kinds of PRO-compatible devices. Some of these devices are: 

• - PSP (Play-station Portable)
• - Mobile phones
• - Small digital cameras (those that can fit in the pocket) etc. 
• - Camcorders
• - Handheld gaming devices

The PRO Duo Stick helps store high-resolution digital pictures, music, movies and other multi-media content. 

Leading manufacturers of the Pro Duo Memory Stick

Sony

SanDisk

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