ACCENTUM Plus Open BoxUltra Fast Charging: Just 10 minutes of charging provides 5 hours of playtime to efficiently get back to outstanding on the go audio. 50 Hour Battery Life: Enjoy exceptional battery playtime that lasts up to 50 hours on a single charge with Bluetooth and ANC active. Sennheiser Signature Sound: Experience high quality audio from a transducer system engineered and manufactured in house. Angled transducers create an expansive soundstage that brings music

Frequency response: 6-30

All in an inconspicuous design that comfortably fits any ear

They offer intuitive

realistic tone and perfectly balanced acoustics

ultimately contributing to remarkably consistent characteristics of each HD 660S produced

► Adaptive acoustics : open and closed ear adapters for situational awareness and passive noise cancellation

3mm stereo connector offers the audiophile-standard plug for connection to devices such as headphone amplifiers and A/V receivers

23 ohm transducers

• TrueResponse transducer system : Delivers a high-end sound experience with impactful bass

Specific uses for product : Communication

High-grade design: These overhead headphones feature an open-back design without back reflections

A larger driver provides improved bass response to compensate for the open design