Bang & Olufsen EarSet 2 Bluetooth Mobile Device (Left Ear) High-fidelity earphone headset made to fit your left ear, with a 3 year manufacturer's warranty Specifically designed air vents to ensure true voice reproduction and a high-fidelity loudspeaker system microphone ensures optimum sound quality B&O has added 2 microphones, with filters to help reduce or cancel extraneous noises that distort both incoming and outgoing signals Compatible with all devices that are Compatible with Bluetooth version 1.1 or higher and headset profile 1.1 and hands free profile 1.0. NOTE: This product is not compatible with iPhone 3GS