In-ear Noise Cancelling & Isolating Wireless Earbuds are compact, cable-free earbuds that use both physical fit (isolation) and electronic technology (ANC) to block external sounds, creating immersive listening by cancelling low rumbles (like engines) and muting higher-pitched chatter, perfect for focus, travel, or quiet enjoyment, often with features like touch controls, sweat resistance, and app-based EQ settings for personalized audio and noise control. 
Key Features & How They Work:
Active Noise Cancellation (ANC): Microphones capture ambient noise, and the earbuds generate opposite sound waves to effectively cancel it out, reducing constant low-frequency sounds (trains, planes).
Passive Noise Isolation (PNI): The physical seal created by the earbud tips in your ear canal blocks sounds, especially effective for higher frequencies like voices and sudden noises.
Wireless & True Wireless: Connect via Bluetooth for untethered freedom, with "True Wireless" meaning each earbud has no connecting wires at all.
Audio Quality: Deliver rich, detailed sound, often with punchy bass and clear highs, enhanced by companion app EQs to tailor the signature.
Comfort & Fit: Come with multiple ear tip sizes (silicone/foam) for a secure, pressure-free seal, crucial for both isolation and extended wear.
Situational Awareness: Many offer "Stay-Aware" or Transparency modes to let in outside sound when needed (e.g., traffic).