Here is the user guide for the iHear WMIC1A Wireless Microphone from Dukane. You can find more information about the iHear at this site : http://dukaneav.com/ihearwmic1a.aspx Dukane is an American company serving the education, corporate, government and house of worship markets for over 85 years. For more information contact: Delia Valdez Dukane Customer Service Representative Phone: 800-076-2485 Fax: (630) 584-5156 Email: AVSales@Dukane.com Website: www.Dukane.com/AV For information on Dukane’s Innovative Convey Response system, go to www.conveyclassrooms.com Dukane AV 2900 Dukane Drive St. Charles, IL 60174