The AH-C840NCW brings Denon’s legendary high-performance sound to sleek, sweatproof earbuds for dynamic lifestyles. Active noise cancellation, seamless connectivity, and up to 35 hours of total battery time* mean effortless listening anywhere life takes you.

  • Active noise cancelling
  • Up to 35 hours of listening*
  • Premium drivers adapted from flagship headphones
  • IPX4-rated water protection
  • Bluetooth LE Audio and Auracast ready
  • Dual microphones for crystal clear calls
  • Unrivaled sound, all-day focus

    These sleek, sweatproof earbuds with active noise cancellation provide unparalleled audio anywhere life takes you.

Denon Signature Sound

Sonic Innovation
For the Past 110 Years

For more than a century, we've crafted cutting-edge audio products that deliver the ultimate detail. Our Japanese heritage inspires us, and each product is hand-tuned by our sound master. Prepare to hear sound differently. 

Audio & ANC
  • Noise CancellingAdaptive Hybrid Noise Cancelling
  • Transparency ModeYes
  • Driver Size12 mm
  • Driver TypeFree-Edge bio cellulose
  • Adjustable EQYes
Bluetooth
  • Quick PairGoogle Fast Pair, Windows Swift Pair
  • Bluetooth Version5.3
  • Bluetooth CodecsAAC, SBC, LC3
  • AuracastYes
  • MultipointYes
Battery & Charging
  • Battery Life–Buds10 hours (ANC off);7 hours (ANC On)*
    *Testing performed by Denon in January 2025 using a production AH-C840NCW unit and software paired with a smartphone. Playback track was a stereo AAC-encoded file. Volume was set to 50% with active noise cancellation disabled, and then tested again at the same volume level with active noise cancellation enabled. Actual battery life varies based on device settings, environment, usage, and additional factors.
  • Battery Life with Case35 hours (ANC off); 24 hours (ANC On)**
    **Testing performed by Denon in January 2025 using a production AH-C840NCW unit and software paired with a smartphone. Playback track was a stereo AAC-encoded file. Volume was set to 50% with active noise cancellation disabled, and then tested again at the same volume level with active noise cancellation enabled. Actual battery life varies based on device settings, environment, usage, and additional factors.
  • Charging Cable TypeUSB-C to USB-C
  • Wireless Charging (Case)Yes
  • Quick Charge5 min for 1 hr playback
  • Case Charge Time2 hr
Voice Calls
  • Number of Microphones2
Comfort & Fit
  • TipsS, LONG S, M, L
Controls
  • Touch ControlsYes, customizable
  • AppYes, Denon Headphones App
General
  • Colors AvailableBlack, White
  • Water ResistanceIPX4
  • Earbud Dimensions, mm35.0 × 21.3 × 25.4
  • Earbud Weight, g5.1 g
  • Case Dimensions, mm58 × 48 × 288 mm
  • Case Weight, g

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