ISmell
Encyclopedia
The iSmell or iSmell Personal Scent Synthesizer was a computer peripheral device developed by DigiScents in 2001. The prototype connected to a personal computer via USB or serial port
Serial port
In computing, a serial port is a serial communication physical interface through which information transfers in or out one bit at a time...

 and was designed to emit a smell when a user visited a web site or opened an email. The device contained a cartridge with 128 "primary odors," which could be mixed to replicate natural and man-made odors. DigiScents had indexed thousands of common odors, which could be coded, digitized, and embedded into web pages or email
Email
Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...

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In 2006, the iSmell was named one of the "25 Worst Tech Products of All Time" by PC World Magazine, which commented that "[f]ew products literally stink, but this one did--or at least it would have, had it progressed beyond the prototype stage.
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