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AH-C840NCW Black

Name: AH-C840NCW Black
Brand: Denon
SKU: DENON-AH-C840NCW-BLACK

True wireless earbuds with active noise cancellation

Model AHC840NCWBKEM

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.

At a glance

All specifications

Driver size: 12 mm
Battery life (hours): 10
Transparency Mode: Yes
Driver Type: Free-Edge bio cellulose
Adjustable EQ: Yes
Bluetooth Version: 5.3

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Features11
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Overview

With adaptive active noise cancelling, whether you’re focusing on work, a workout, or just diving into your favorite playlist, stay connected with the right balance of sound isolation and ambient awareness.

Highlights

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

About Denon

For over a century, we've been crafting cutting-edge audio products that deliver on ultimate detail, inspired by our Japanese heritage, with each product hand-tuned by our sound master. Prepare to hear sound differently.

All Denon products

Features

Unrivaled sound, all-day focus
These sleek, sweatproof earbuds with active noise cancellation provide unparalleled audio anywhere life takes you.
All-day listening for life on the go
With 10 hours of playback on a single charge* with ANC off, 7 hours with ANC on, and 5-minute quick charging, you’ll never have to worry about your playlist dropping out mid-workout or drained earbuds during an important call. And with IPX4-rated sweat and splash protection, the beat goes on, no matter where your adventures take you.
Feel the comfort, hear the difference
You don’t have to sacrifice comfort for great sound on the go. Reveal the detail in your favorite songs with high-performance earbuds with a fit that’s so comfortable you’ll forget they’re there—but the vivid, spacious sound will remind you.
Stay in the zone with adaptive hybrid ANC
Tune out distractions with adaptive active noise cancellation or choose Transparency mode to stay aware of your surroundings.
Up to 35 hours of listening*
Enjoy 10 hours of playback on a single charge with ANC off, or 7 hours with ANC on*. The case charges the earbuds on-the-go for additional listening time*.
Dual microphones for clear voice calls
Two strategically placed microphones in each earbud focus on your voice while minimizing background noise so both callers experience crystal-clear, distraction-free sound.
IPX4-rated water protection
Whether you’re powering through a workout or dashing through a downpour, your earbuds stay in place and keep performing. They’re built tough with IPX4-rated protection to resist sweat and splashes, keeping up with your every move.
Bluetooth LE Audio and Auracast ready
State-of-the-art Bluetooth technology provides superior audio and power performance and seamless sharing.
Five-minute quick charge and wireless charging
Power up fast and keep momentum going with 5 minutes of charging to fuel an hour of continuous listening. Wireless charging lets you charge without the clutter.
Denon Headphones app
Unlock the full potential of your experience with the Denon Headphones app. Adjust sound settings and enjoy automatic updates for the best performance.
Premium sound meets all day performance
Premium sound meets all day performance

Specifications

Driver size: 12 mm
Battery life (hours): 10
Model code: DENON-AH-C840NCW-BLACK; Quote it when you ask a specialist.

Audio & ANC

Noise Cancelling: Adaptive Hybrid Noise Cancelling
Transparency Mode: Yes
Driver Size: 12 mm
Driver Type: Free-Edge bio cellulose
Adjustable EQ: Yes

Bluetooth

Quick Pair: Google Fast Pair, Windows Swift Pair
Bluetooth Version: 5.3
Bluetooth Codecs: AAC, SBC, LC3
Auracast: Yes
Multipoint: Yes

Battery & Charging

Battery Life–Buds: 10 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 Case: 35 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 Type: USB-C to USB-C
Wireless Charging (Case): Yes
Quick Charge: 5 min for 1 hr playback
Case Charge Time: 2 hr