Sennheiser Accentum Open TW - Black

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.

• Model: OTW1, OTW1 R, OTW1 L, OTW1 C
• Wearing style: True Wireless stereo earbuds
• Ear coupling: in-concha
• Frequency response: 25 Hz to 15 kHz
• Transducer principle: dynamic
• Transducer size: 11 mm
• Sound pressure level (SPL): 109 dB (1 kHz/1 mW)
• THD (1 kHz, 94 dB SPL): < 0.08% (1 kHz/94 dB)
• Noise cancellation: n/a
• Microphone principle: MEMS
• Microphone frequency response: 100 Hz to 10 kHz
• Microphone pick-up pattern (speech): 2 microphones per earbud, beamforming array for noise reduction
• Power supply:
  • built-in lithium rechargeable batteries:
    • earbuds (R and L): 3.85V, 35-36mAh, 0.139Wh max.
    • charging case: 3.7V, 380-400mAh, 1.48Wh max.
  • input:
    • earbuds (R and L): 5 V, max. 100 mA
    • charging case: 5 V, max. 500 mA
  • output:
    • earbuds (R and L): none
    • charging case: 5 V, max. 100 mA x 2 (R and L)
• Charging method: via charging case, USB charging via USB C socket: 5 V, 500 mA
• Operating time:
  • 6.5 hrs with rechargeable battery of the earbud
  • 21.5 hrs with rechargeable battery of the charging case
  • (test conditions: smartphone within 1 m distance, Bluetooth AAC codec, volume level 50%)
• Charging time of rechargeable batteries:
  • approx. 1 hour for full charge
  • approx. 10 minutes for 1.5 hour of music playback
  • (ambient temperatures <15°C or >30°C increase the charging time)
• Temperature range:
  • operation: 0°C to +40°C
  • charging: +5°C to +35°C
  • storage: -20°C to +60°C
• Relative humidity:
  • operation: 10 to 80%, non condensing
  • storage: 10 to 90%
• Magnetic field strength:
  • earbuds: 60 mT
  • charging case: 47 mT
• Ingress protection: earbuds: splash proof (IPx4)
• Weight:
  • earbuds: approx. 4.35 g each
  • charging case: approx. 29.3 g
  • both earbuds and charging case: approx. 38 g
• Dimensions:
  • earbuds: approx. 18.27 x 33.34 x 19.38 mm (W x H x D)
  • charging case: approx. 51.77 x 50.18 x 25.36 mm (W x H x D)
• Sensors: in-ear sensor, capacitive touch sensor
• Bluetooth:
  • Version: Bluetooth 5.3 certified, class 1
  • Transmission frequency: 2,402 MHz to 2,480 MHz
  • Modulation: GFSK, π/4 DQPSK, 8DPSK
  • Profiles: AVRCP, A2DP, HFP
  • Output power: 10 mW (max)
  • Codec: AAC, SBC
  • Device name: ACCENTUM Open
  • Number of active connections: 2
• Required apps: no companion app