Sennheiser Consumer Audio Sennheiser HD1 Wireless Headphones with Active Noise Cancellation - Black

* 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 Ω. 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 Ω. Impedance : Active: 480 Ω * 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, th...