Sennheiser Accentum Open – In Ear Earbuds

Sennheiser ACCENTUM Open Wireless Earbuds

ACCENTUM Open takes it to the next level with Sennheiser-tuned sound, delivering an open wireless design that stays with you all day long. Superior audio guaranteed for up to 28 hours – not "just" earbuds, a lifehack.

• Sennheiser-tuned sound crafted by acoustic experts for rich, detailed audio
• Open-ear design naturally blends music with surroundings for better awareness
• 11mm dynamic transducers with SBC and AAC codec support
• Up to 28 hours total battery life (6.5 hours earbuds + 21.5 hours charging case)
• Quick charge provides 1.5 hours of playback in just 10 minutes
• Bluetooth 5.3 with multipoint connectivity for seamless device switching
• Pairs with up to 8 devices with 2 active connections simultaneously
• IPX4 splash and sweat resistant earbuds
• Lightweight, breathable ergonomic stem design for all-day comfort
• Dual MEMS microphones per earbud with beamforming and AI-based noise reduction
• Smart Pause automatically stops playback when earbuds are removed
• No app required – just pair and play
• Available in Cream, Black, and Blush

Highlights & Key Technologies

Tuned for Superior Sound & Extra Dopamine
Treat your ears to the thrill of Sennheiser-tuned sound. With powerful 11mm dynamic transducers and SBC and AAC audio codec support, ACCENTUM Open earbuds deliver rich, detailed sound with clarity and depth. Crafted by acoustic experts, every note is engineered for an exceptional listening experience that brings your music to life. Get ready to be wowed by superior sound quality that makes every track feel new. Simply great sound, every time.

With Open Design – Perfect for Eavesdropping
Your sounds? Or your world? Why choose? The open earbud design keeps you tuned into your surroundings – whether you're chatting with friends, staying alert to traffic, or just soaking up the vibes. Flexible, reliable, and always in sync with your life, the open-ear design naturally blends your music with your environment for better awareness. No more FOMO – stay in the loop while your music keeps you moving. Rock both ACCENTUM Open earbuds or just one if you want to stay aware of what's happening around you. Perfect for social butterflies who want to enjoy their tunes without missing a beat.

All-Day Play for All-Day Slay
With up to 28 hours of total playtime, you'll likely run out of energy before your earbuds do. From the morning commute to after-hours fun, ACCENTUM Open keeps the music rolling without missing a beat. Enjoy up to 6.5 hours of playtime from the earbuds and an additional 21.5 hours from the pocket-sized USB-C charging case, so all-day listening becomes effortless. The quick charge function gives you approximately 1.5 hours of music playback after just 10 minutes of charging. With IPX4-rated splash and sweat resistance, your wireless earbuds keep performing, rain or shine, no matter what you're up to. All-day listening, rain or shine.

Feel Your Tunes, Not the Earbuds
With the comfort of barely-there earbuds, ACCENTUM Open earbuds are the perfect choice if you find ear canal designs too insulating or too large to fit securely. The open-ear stem design means no uncomfortable pressure or ear canal invasions – your lightweight, breathable earbuds stay in place and feel weightless all day long. The convenient stem design makes them easy to pop in and out whenever you like. The lightweight, ergonomic stem design stays in place without the pressure or isolation of traditional in-ears, ensuring breathable fit and high comfort for extended wear. Meet your perfect fit.

Effortless Use, No Manual Needed
Life's complicated enough already – ACCENTUM Open earbuds keep things simple. Multipoint connectivity lets you seamlessly switch between two devices, so you're always in sync, whether it's videos, calls, or music. No need to fumble with settings. The earbuds can pair with up to 8 devices and maintain 2 active connections simultaneously, making it easy to switch between your phone, tablet, or laptop without missing a beat. Smart touch controls make everything intuitive – no manual required, no app integration needed. Just pair and play. Smart Pause stops playback the moment you remove an earbud and resumes when you put it back in, so you'll never miss a moment. The dual MEMS microphones on each earbud with beamforming array, combined with AI-based noise reduction, ensure crystal-clear calls and easier voice assistant access even in noisy environments. Just connect and go. Now that's music to your ears.

Ready for Rain or Shine
With an IPX4 splash resistance rating, you and your ACCENTUM Open earbuds can handle any weather. The earbuds can be used in the rain and are splash and sweat resistant, though they are not suitable for immersion in water or wearing in the shower. The charging case is not splash waterproof and should be kept dry. Whether you're working out, commuting in the rain, or just going about your day, ACCENTUM Open keeps the music flowing no matter what Mother Nature throws at you.

Stay Aware, Stay Engaged
The open-ear design naturally blends your music with your surroundings for better awareness. Unlike traditional closed earbuds that isolate you from the world, ACCENTUM Open's innovative design lets ambient sounds flow naturally, so you can hear announcements on the train, have quick conversations without removing your earbuds, or stay alert to your environment while enjoying your favorite tracks. Your sounds, your choice – experience music without missing out on what's happening around you.

Details & Specifications

MODEL INFORMATION
Model: OTW1, OTW1 R, OTW1 L, OTW1 C
Article number (SKU) ACCENTUM Open Cream: 700446
Article number (SKU) ACCENTUM Open Black: 700430
Article number (SKU) ACCENTUM Open Sakura: 800090

DESIGN
Wearing style: True wireless stereo earbuds
Ear coupling: In-Concha

AUDIO PERFORMANCE
Transducer principle: Dynamic
Transducer size: Dynamic, 11mm diameter
Frequency response: 25 Hz to 15 kHz
Sound pressure level (SPL): 109 dB (1 kHz/1 mW)
THD (Total Harmonic Distortion): <0.08% (1 kHz/94 dB)
Impedance: Not applicable (active Bluetooth headphones)
Active Noise Cancellation: n/a

MICROPHONE
Microphone principle: MEMS
Microphone frequency response: 100 Hz to 10 kHz
Microphone pick-up pattern: 2 microphones per earbud, beamforming array for noise reduction

CONNECTIVITY
Bluetooth version: Bluetooth 5.3 compliant, class 1
Bluetooth output power: 10 mW (max)
Transmission frequency: 2,402 MHz to 2,480 MHz
Modulation: GFSK, π/4 DQPSK, 8DPSK
Supported profiles: A2DP, AVRCP, HFP
Supported codecs: SBC, AAC
Device name: ACCENTUM Open
Number of active connections: 2
Required apps: No companion app

BATTERY AND POWER
Power supply: Built-in lithium-ion rechargeable batteries
Battery capacity left/right earbud: 3.85 V, 35-36 mAh, 0.139 Wh max
Battery capacity charging case: 3.7 V, 380-400 mAh, 1.48 Wh max
Input voltage earbuds: 5 V, max 100 mA
Input voltage charging case: 5 V, max 500 mA
Output voltage charging case: 5 V, max 100 mA x 2 (R and L)
USB charging via USB-C socket at charging case: 5 V, 500 mA
Battery time: Up to 6.5 hrs music playtime with earbuds; Up to 21.5 hrs overall music playtime with charging case (Test condition: smartphone within 1 m distance, Bluetooth AAC codec, volume level 50%)
Charging time: Approx. 1 hr for fully charged; After 10 min charging 1.5 hrs music playtime
Charging time note: Ambient temperatures <15°C or >30°C increase the charging time

OPERATING CONDITIONS
Temperature range operation: 0°C to +40°C
Temperature range charging: +5°C to +35°C
Temperature range storage: –20°C to +60°C
Relative humidity operation: 10 to 80%, non-condensing
Relative humidity storage: 10 to 90%

PHYSICAL SPECIFICATIONS
Weight both earbuds and charging case: Approx. 38 g
Weight single earbud: Approx. 4.35 g
Weight charging case: Approx. 29.3 g
Dimensions earbuds: Approx. 18.27 x 33.34 x 19.38 mm (W x H x D)
Dimensions charging case: Approx. 51.77 x 50.18 x 25.36 mm (W x H x D)
Magnetic field strength earbuds: 60 mT
Magnetic field strength charging case: 47 mT
Ingress protection: IPX4, splash resistant (earbuds only)
Sensors: In-ear sensor, capacitive touch sensor

PACKAGE CONTENTS
ACCENTUM Open earbuds (left and right)
Charging case
USB charging cable with USB-C and USB-A connector, length approx. 0.4 m
Quick guide
Safety guide
Compliance sheet

COUNTRY OF ORIGIN
Designed by Sennheiser in Germany, Made in China

WARRANTY
Warranty: 12 months

COMPLIANCE
General Product Safety Regulation (EU) 2023/988
Battery Regulation (EU) 2023/1542
RoHS Directive (2011/65/EU)
Radio Equipment Directive (2014/53/EU)
RoHS Regulations (2012)
Radio Equipment Regulations (2017)
WEEE Directive (2012/19/EU)
Battery Regulations (2015)
WEEE Regulations (2013)