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The Sennheiser HDC451-1 Open Active Noise Cancellation Headphones NoiseGard™ mobile are open stereo headphones with active noise compensation for mobile applications.
Features of the Sennheiser HDC451-1 Open Active Noise Cancellation Headphones:
* Reduction of ambient noise by up to 10 dB
* Protects the hearing and reduces stress
* Lightweight and comfortable to wear
* Considerably improves audio reproduction quality in noisy environments
* Powered via 2 AA size alkaline batteries or environmentally friendly NiCd rechargeable batteries
* Delivery includes: 1 HDC 451 NoiseGard™ mobile
* 2-year guarantee
Specifications of the Sennheiser HDC451-1 Open Active Noise Cancellation Headphones:
* Transducer principle dynamic, open
* Ear coupling supraaural
* Nominal impedance 250 Ohm
* Input voltage range 387 mV (1 Pa, 94 dB)
* Max. Sound pressure level (aktiv) 100 dB linear
* Operating voltage (mains) 2 x 1,5 V
* Contact pressure ca. 1,6 N
* Weight w/o cable ca. 110 g
* Connection cable 2 m
* Jack plug 3,5 mm stereo
* Power supply 2 x 1,5 V (AA) Alkali- Mangan-Batterien oder 2 x 1,2 V Akkus Mignon (AA) 600 mAh
* Operating time ca. 80 h (Battery) ; ca. 20 h (Akku)
* Noise compensation (active) 10 dB ± 3 dB
* Frequency response (headphones) 20.....18000 Hz
* THD, total harmonic distortion < 1 %
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