Some in-ear models are described as sweat- or water-resistant (commonly IPX4). A few higher-end models list broader dust/sweat/water protection with an IP54 rating. Other items explicitly state there is no water-resistance rating for the product or its case.
Most listings note built-in microphones. Several specify multi-microphone arrays, beam-forming microphones, and voice-isolation features designed to improve call clarity and voice pickup in windy or noisy environments.
Many listings include Active Noise Cancellation and a Transparency (or similar) mode to let in ambient sound. Some results also list adaptive features (Adaptive EQ or Adaptive Audio) and mention conversation-aware volume adjustments.
