"Sennheiser Consumer Audio Momentum 4 Wireless Headphones - Bluetooth Headset for Crystal-Clear Calls with Adaptive Noise Cancellation, 60h Battery Life, Lightweight Folding Design - Black ) Introducing the new MOMENTUM 4 Wireless - Inspired by music. Audio excellence & comfort re-defined: The new MOMENTUM 4 Wireless once again raises the bar – delivering best-in-class sound quality with advanced Adaptive Noise Cancellation and exceptional comfort. With smart, intuitive features that enhance every interaction and an outstanding 60-hour battery life, there’s nothing between you and an incredible listening experience. Sennheiser Consumer Audio HD 660S2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black From thundering timpani, to the melodic sound of a guitar, the impressive singing voice of your favorite artist, or the beat of electronic dance music, nothing creates drama like powerful bass. Ideal for music lovers, the non-fatiguing, high-end HD 660S2 now delivers even more impact and emotion. Our engineers optimized the HD 660S's surround, transducer airflow, and coil to double the sound pressure at the lowest octaves. You can feel the lowest note on the piano (27.5 Hz) or the kick of the bass drum (45-60 Hz) as if you were there at the recording studio, allowing you to pick out individual instruments and discover new sonic details. The relaxed sound and open-black design make it an extremely comfortable headphone that is also suitable for long listening sessions. The headphone's warm, relaxed sound is reflected in its timeless design and elegant bronze accents. With warm tuning, smooth treble and strong bass, the standard-setter for extended listening is now also the standard for extended bass. Product 1: Maximum audio resolution with Sennheiser Signature Sound: Enjoy premium music quality all-day long thanks to the headphone's audiophile-inspired 42mm transducer system and aptX Adaptive.Specific uses for product : Music Product 1: Personalized sound via the Sennheiser Smart Control App: Adjust the sound to your individual listening preferences via the integrated equalizer, presets and sound modes - for a unique sound experience. Product 1: Stay immersed in your music: Thanks to the headphone's Adaptive Noise Cancellation, you stay distraction-free - and with the Adjustable Transparency Mode you stay in touch with the world around you. Product 1: Exceptional comfort and long battery life: Lightweight, foldable design with padded headband and deeply cushioned ear pads for long-lasting comfort - up to 60 hours of playback time with fast charging. Product 2: Natural, relaxed, high-fidelity sound with extra sub bass: Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response and an intimate sound with great timbre Product 2: Airflow-optimised 42mm high-performance transducers: Improved ventilation due to a uniquely powerful vented magnet system for minimal distortion and air displacement control through steel mesh damping Product 2: Double the sound pressure at the lowest octaves: You can feel the lowest note on the piano (27.5 Hz) or the kick of the bass drum (45-60 Hz) as if you were there, at the recording studio Product 2: Exceptional comfort and build quality: The open-back design offers exceptional breathability and the plush ear cushions deliver maximum comfort - for long listening sessions Date First Available: January 30, 2024 Battery Charge Time: 2 Hours Compatible Devices: Bluetooth-enabled devices Noise Control: Active Noise Cancellation Specific Uses For Product: Music Included Components: Ear Cushions Age Range Description: Adult Wireless Communication Technology: Bluetooth ASIN: B0CTKSMN74 Charging Time: 2 Hours Battery Average Life: 60 Hours Headphone Folding Features: Over Ear Form Factor: Over Ear Battery Life: 60 Hours Control Type: Media Control, Music Bluetooth Range: 10 Meters Built-In Media: Ear Cushions Enclosure Material: Aluminum Audio Driver Size: 42 Millimeters Audio Driver Type: Dynamic Driver Material: Aluminum Ear Placement: Over Ear Brand: Sennheiser Consumer Audio Cable Feature: Without Cable Wireless Technology: Bluetooth Additional Features: Integrated Equalizer Age Range (Description): Adult Cable Features: Without Cable Headphones Ear Placement: Over Ear Connectivity Technology: Wireless"