Seen one of these devices and wondered what it was?
Last year Arbitron started implementing a new way of measuring how people listen to radio by replacing paper based systems used by Nielsen Media Research. By encoding a signal in participating radio stations, listeners carrying these portable measurement devices automatically record each location they enter, whether it be an office, car wash, retail store, or other facility. Plans are well underway to deploy in the top 50 North American markets by the end of 2008. European deployment is already underway.