Active Noise Cancelling Mode: These noise cancelling headphones are equipped with 2 outward-facing and 2 inward-facing microphones effectively block out background noise up to 35dB, enabling you to hear crystal clear music and offering you stable phone calls (such as on airplane, train, bus or gym) Ambient Mode: TaoTronics truly bluetooth headphones allow you to hear surrounding live sound and keep you aware of emergency - colleagues’ voices, flight/subway announcements and street traffic while you still enjoy music simultaneously Easy Pairing & Unbreakable Connectivity: These bluetooth earbuds are very easy to pair - just take them out from the charging case and they’ll automatically connect to your paired device. Advanced Bluetooth 5. 1 technology provides faster pairing, strong connection within 15m/50ft Incredible Music Immersion: These TWS earbuds engineered to produce sound at different frequency with extraordinary clarity and punchy bass. With the help of 9.2mm high fidelity dynamic driver, you can lose yourself in stunning music Extended Playtime: Using a low power consumption chipset, in-ear stereo headset offers 8 hours of playtime with ANC off, and extending to 32 hours with the charging case