[. . . ] [. . . ] Benefits and Features: Sennheiser sound ­ a quality speaker delivers great acoustic performance Noise canceling clarity ­ the microphone filters out ambient noise, so your voice is always clear and easy to understand Reliable speech recognition ­ the microphone is specially designed for your device's speech recognition function Keep one ear free ­ the single-sided design keeps you in touch with your surroundings Fully flexible boom arm ­ adjust the microphone for optimal voice pick-up and comfort Light and comfortable ­ with the lightweight headband, it's easy to forget you are even wearing a headset Peace of mind ­ thanks to the 2-year international warranty Technical Data PC 21-II EAN No. General Data Wearing style Cable length Connector sockets Weight Headphones Frequency response Impedance Sound pressure level Microphone Frequency response Pick-up pattern Impedance Sensitivity Accessories Supplied Packaging Design Dimension of product packaging (W x H x D) Dimension of inner master carton (W x H x D) Dimension of outer master carton (W x H x D) Languages Warranty 4 044155 078596 6 15104 22903 7 504520 Single-sided headband 3m / 9. 8ft 2 x 3. 5 mm 60 g 40-18, 000 Hz 32 109 dB 80 ­ 15, 000 Hz Noise canceling 2k -38dBV/Pa None Full blister 235 x 205 x 70 mm N/A x N/A x N/A 440 x 510 x 400 mm English, Dutch, French, German, Italian, Portugese, Spanish 2 years [. . . ] [. . . ]