http://www.noise-cancelling-headphones-reviews.com/nokia-bh-905-review-and-unboxing/
180 mm x 155 mm x 59 mm Weight 175 g Operating keys Multifunction key for power on/off, answer/end, voice dial, and redial Volume up Volume down Play/pause Next track Previous track Active noise cancelling on/off Connectors 3.5 mm Nokia AV connector Supporting adapters for: – 2.5 mm Nokia AV connector – Standard 3.5 mm jack – Standard 6.3 mm jack – Standard airplane jack Operating temperature -15°C to +55°C Operating range (maximum) 10 m (Bluetooth use) Power Power supply Rechargeable 600 mAh Li-Ion Polymer battery Operating time (maximum) Talk (Bluetooth): 24 h Music (Bluetooth): 25 h Talk (Bluetooth, with active noise cancellation): 15 h Music (Bluetooth, with active noise cancellation): 16 h Music (Wired, with active noise cancellation): 40 h Hands-free phone calls and music listening (without active noise cancellation) possible even with empty battery (wired connection) Standby time (maximum) With Bluetooth: 600 h Charging time (maximum) 2 h Sound and media Frequency response From 15 Hz to 20 kHz Additional sound and media information Speaker impedance: 32 ohm Speaker drivers: 32 mm high performance drivers Number of noise cancelling microphones: 8 2 microphones capturing speech and advanced digital signal processing (DSP) for clear communication Active noise cancellation technology: Reduces up to 99% background noise
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