slotMusic is a type of microSD memory card

Memory card

A memory card or flash card is an electronic flash memory data storage device used for storing digital information. They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players, and video game consoles...

 developed by SanDisk preloaded with music in MP3

MP3

MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is a patented digital audio encoding format using a form of lossy data compression...

 format. They were first available at Wal-Mart

Wal-Mart

Wal-Mart Stores, Inc. , branded as Walmart since 2008 and Wal-Mart before then, is an American public multinational corporation that runs chains of large discount department stores and warehouse stores. The company is the world's 18th largest public corporation, according to the Forbes Global 2000...

 and Best Buy

Best Buy

Best Buy Co., Inc. is an American specialty retailer of consumer electronics in the United States, accounting for 19% of the market. It also operates in Mexico, Canada & China. The company's subsidiaries include Geek Squad, CinemaNow, Magnolia Audio Video, Pacific Sales, and, in Canada operates...

 stores in the United States in October 2008. The current selection of songs comes from Universal Music Group

Universal Music Group

Universal Music Group is an American music group, the largest of the "big four" record companies by its commanding market share and its multitude of global operations...

, Sony BMG, Warner Music Group

Warner Music Group

Warner Music Group is the third largest business group and family of record labels in the recording industry, making it one of the big four record companies...

 and EMI Music. As of mid-2011, SanDisk's website lists a total of 14 albums available in the SlotMusic format.

The audio files contain no digital rights management

Digital rights management

Digital rights management is a class of access control technologies that are used by hardware manufacturers, publishers, copyright holders and individuals with the intent to limit the use of digital content and devices after sale. DRM is any technology that inhibits uses of digital content that...

, and are encoded at minimum bitrate

Bitrate

In telecommunications and computing, bit rate is the number of bits that are conveyed or processed per unit of time....

s of 256 to 320 kbit/s.

SlotMusic albums may also include high-quality images and videos in multiple formats. The contents of each microSD card may be altered by the user, enabling them to add or remove files from the slotMusic card as desired. Another type of card, slotRadio

SlotRadio

slotRadio is a music format delivered on a memory card . Preloaded on microSD cards, slotRadio gives consumers access to a large library of music but unlike individual MP3s that are purchased, the playlist is predetermined and the user has only the ability to skip songs forward much like how radio...

, has been developed for 2009 and has radiolike controls. SlotRadio has more restrictions on how it works, such as not being able to backtrack to a previous song.