Up to 35dB hybrid active noise cancellation - Effectively isolate excess outside noise: With hybrid active noise cancellation technology, the feed-forward and feedback microphones work together to effectively separate background noise. Whether you're outdoors, on the bus or metro, one-touch for up to 35dB noise cancellation. Redmi Buds 4 Wireless Earbuds blocks out the hustle and bustle 3 ANC level options and adaptive ANC mode - Just the right level of quietness: Intelligent scene judgement based on ambient noise levels. Redmi Buds 4 Earbuds intelligently switches between 3 ANC levels under adaptive mode supported by AI algorithm and offers a more comfortable noise-cancellation experience Redmi Buds 4 ANC Earbuds - AI noise reduction - Get every word across clearly: The AI voice algorithm accurately differentiates human voice and ambient noise, so that even in the noisy environments, the listener will hear every word you say, loud and clear Dual transparency mode - Simple communication even with your earbuds on: Want to switch between Music Mode and Chat Mode? Long-press to enter transparency mode and feel free to say hi to friends around you. Set up enhance voice mode for natural communication with your earbuds on. 10mm dynamic driver, 0.006mm ultra-thin diaphragm - Pleasant to listen to vivid vocie and instrumental sound: The large dynamic driver unit makes the voice sound crisper, the lower frequencies fuller and the treble brighter. Choose a high-quality 0.006mm diaphragm to bring out even more detail in your favourite music Up to 30 hours extra-long battery life with case - Surround yourself with your favourite music: Enjoy up to 6 hours of battery life on a single charge and up to 30 hours of battery life when paired with a charging case, so you can enjoy great music both day and night. Fast charge supported. Get up to 1 hour of music playback from 5 minutes of charging. Take a break and then pick up right where you left off Specifications: Product model no.: M2137E1 Earbud input parameters: 5V鈳?100mA Charging case input parameters: 5V鈳?450mA Wireless connection: Bluetooth-compatible 5.2 Bluetooth-compatible protocols: HSP, HFP, A2DP, AVRCP Operating distance: 10m (open space free of obstacles) Single earbud net weight: Approx. 4.5g Total weight including charging case: Approx. 55g Charging port: Type-C Speaker impedance: 16Ω±15% Package included:2 x Earbuds1 x Charging Case1 x Charging Cable1 x English User ManualOther items not include