Urbanears Bagis In-Ear Headphone, Dark Grey (4091017) - Inspired by the building blocks we played with as children, the SnapConstruction feature lets you connect your ear buds around your neck. That way, you can easily find them and continue enjoying your music whenever you're ready - Most music devices today are also cell phones. That's why all our headphones come with a built-in microphone and remote. Use it to pick up calls, or fast forward or rewind your music - Audio: 9mm handmade drivers. Frequency response: 20Hz-20kHz. Impedance: 16. Sensitivity: 107dB. Max input power: 5mW Connectivity Technology: Wired Connectivity technology : Wired