The iSmell or iSmell Personal Scent Synthesizer was a computer peripheral device developed by DigiScents in 2001. It did not work to well,. The prototype connects to a personal computer via USB or serial port, and is designed to emit a smell when a user visits a certain web site or opens an email. The device contains a cartridge with 128 "primary odors," which can be mixed to replicate natural and manmade odors. DigiScents has indexed thousands of common odors, which can then be coded, digitized, and embedded into web pages or email.