Sennheiser IE 80 EAST In-Ear Headphones (Discontinued by manufacturer) Dynamic speaker systems with powerful neodymium magnets ensure outstanding sonic accuracy and clarity.Connectivity Technology: Wired Extremely durable housing and rugged, interchangeable cable Unique bass frequency response tuning functionality 16-ohm impedance provides compatibility with virtually every portable audio device including mobile phones and tablets 2 year warranty when purchased from an authorized Sennheiser dealer