B01MYAC300 Sennheiser HD1 Wireless Headphones with Active Noise Cancellation – Black (Discontinued by Manufacturer)

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Closed back, around-ear design featuring Bluetooth 4.0 technology and immediate pairing to smart devices using NFC connectivity for wireless freedom. Connectivity Technology: Wireless
NoiseGard hybrid active noise cancellation blocks ambient noise using 4 microphones for ultimate isolation to dramatically improve sound quality in noisy environments
Sensitivity as per 121 TR 9-5:- 44 dB V/Pa , impedance: 18 ??. 22 hour battery life with both Bluetooth and Noise Gard activated to insure performance during long commutes or plane flights;;Ear coupling : Circumaural;Charging time : Approx. 3 hrs. Supported Profiles : A2DP + AVRCP + HSP + HFP. Impedance : Passive: 28 ??. Impedance : Active: 480 ??
Technology uses 2 built-in microphones working seamlessly to improve voice quality and remove external noise during phone calls.2 year global warranty when purchased from an authorized Sennheiser dealer
Its especially low profile was optimized for the use on mobile devices.Fitted with jack plugs on both ends, the cable is completely detachable and can be replaced if necessary.
Frequency Response – 16 Hz ??2000 Hz , Impedance – passive: 28 ohm, active: 480 ohm