The Sennheiser Momentum 2.0 Wireless (also marketed as the HD1 Wireless) is a premium pair of closed-back, active noise-cancelling Bluetooth headphones. Known for combining audiophile-grade sound quality with a luxurious, retro-inspired aesthetic.

Key Features and Specifications

• Premium Materials: Features a stainless steel headband covered in genuine leather and plush memory foam ear pads. 
• Audio Performance: Delivers a rich, warm, and slightly bass-forward sound signature with clear mid-range and detailed treble.
• NoiseGard Hybrid ANC: Employs a 4-microphone system to block ambient city and commute noise. Note that the active noise-cancelling remains on by default whenever the headphones are used wirelessly.
• Connectivity: Uses Bluetooth 4.0 paired with aptX codec support for CD-quality audio playback on compatible Android or PC devices. It also features NFC for instant tap-to-pair functionality.
• Battery Life: Offers up to 22 hours of playback with both Bluetooth and ANC active. 
• Passive Listening: A detachable 3.5mm locking cable is included so you can continue listening even if the battery runs completely flat.

Controls and Usability

The right earcup houses all physical controls: 

• Power Button: Turns the device on/off and initiates Bluetooth pairing mode when held down.
• Multi-function Slider: Slid up or down to adjust volume, and pressed down once, twice, or thrice to play, pause, or skip tracks.
• VoiceMax Microphones: Dual omnidirectional microphones work to suppress background noise for clear voice and phone calls.