Released: 22nd December 2025. ACCENTUM Open brings a dose of Sennheiser’s sound in a lightweight open design. With 28-hour battery life, seamless multitasking, and IPX4 splash resistance, these earbuds offer rich, natural sound without isolating you.
Key features:
– Sennheiser tuned sound: Tuned by acoustic experts for a superior open sound, they deliver rich, detailed sound that’s finely tuned for clarity and depth. Enjoy premium audio experience that feels alive and blends naturally with the world around you.
– Stay aware, stay engaged with open design: Calls, kids, or life—you‘re always in the loop while your music keeps you moving. Connected, available, and present, all day long thanks to the natural awareness of open design.
– All-day playtime: Up to 28 hours of total playtime with the pocket-sized charging case, keeping your music going from morning to night.
– Breathable fit: A lightweight, open design with an ergonomic stem that ensures comfort without the pressure, fatigue, or isolation of traditional in-ear.
– Effortless use, no manual needed: Switch between devices effortlessly with multipoint connectivity—calls, music, no fuss. Enjoy smart pause, intuitive touch controls, and pairing with up to 8 devices, all in a design so simple and ready to go—no manuals, no apps, just press play.
– 11 mm dynamic transducer: Provides powerful, dynamic sound so you can enjoy a balanced, full-spectrum listening experience.
– Rain or shine ready: IPX4 splash resistance rating to handle any weather.
Product specification:
Wearing style True wireless stereo earphones Ear coupling In-Concha
Connectivity Bluetooth 5.3 compliant, class 1, 10 mW (max) Bluetooth Classic Speaker sensitivity 109 dB SPL (1 kHz / 1 mW) Speaker THD <0,08% (1 kHz / 94 dB) Speaker impedance Not applicable (active BT headphones) Active Noise Cancellation Not applicable
Transmission frequency/ modulation
2,402 MHz to 2,480 MHz; GFSK, π/4 DQPSK / 8DPSK
Mic principle MEMS
Supported profiles A2DP, AVRCP, HFP Supported codecs SBC, AAC
Speaker principle Dynamic
Speaker type/size Dynamic, 11 mm diameter Speaker frequency range 25 Hz to 20 k Hz
Mic frequency range 100 Hz to 10 kHz
Mic pick-up pattern 2 mics per earbud, beamforming for noise reduction
Battery lifespan Up to 6 hrs music playtime with earbuds Up to 28 hrs overall music playtime with
charging case (test condition: iPhone, mid
volume level 85 dB)
Charging time Approx. 1 hrs for fully charged; After 10 min charging 1.5 hrs music playtime
Battery type Built-in Lithium-Ion rechargeable batteries Left/right earbud: 35~36 mAh
Charging case: 380~400 mAh
Power supply 5 V⎓, 500 mA max; USB charging via USB-C socket at charging case;
Weather resistance IPX4, splash resistant (earbuds only)
Product weight 38 g (both earbuds and charging case) 4.35 g (single earbud) / 29.3 g (charging case)
Product dimension 51.77 x 50.18 x 25.36 mm
(earbuds and charging case)
Operating condition Operating Temp: 0 to +40°C
Charging Temp: 5 to +35°C
Rel. humidity 10 to 80%, non-condensing
Storage condition Temp: –20 to +60°C
Rel. humidity 10 to 90%
App support No app support
Country of origin Designed by Sennheiser in Germany, Made in China
Custom tariff code 851762 (BT headsets)
HAZMAT UN # UN 3481
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