Noise Cancelling: Hear more of what you want and less of what you don't thanks to our noise cancelling (4 mic) technology, with the Smart Ambient feature that eliminates audio distractions JBL Signature Sound: Using Bluetooth connection, the dynamic 6.8mm drivers provide bold sound and rich bass, while never missing a beat thanks to 8-16 hours of fast-charging battery life Waterproof and Dustproof: The JBL Reflect Aero earphones are reliable wherever you go and regardless of weather conditions, with dust-proof and waterproof functions, these earphones have no limits