Sennheiser Bluetooth 4.0 headset, binaural, ultra noise cancelling microphone, double ear, talk time up to 15 hours, Sennheiser HD sound, Wearing style Headband Frequency response (microphone) 150 Hz - 6,800 Hz Frequency response (headphones) 150 Hz - 15,000 Hz Microphone Ultra noise-cancelling Sound pressure level (SPL) Max. 118dB (SPL) limited by ActiveGard Weight 82g / 2.89 oz Charging time 2h 30min (50% in 40min) Technology Bluetooth Version 4.0 / supported profiles: HSP 1.2, HFP 1.6, A2DP 1.2 Range Up to 25 m / 82 ft Talk time Up to 15h Speaker type Dynamic, neodymium magnet

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