[Active Noise Cancellation] Active 3-layer hybrid noise cancellation. 1. Outward facing microphone detects external sounds and against them with equal noise cancelling to cancel noise. 2. Inward facing microphone listens to the ear canal inside to pick up internal sounds and produce noise cancelling again to double cancel residual noise. 3. The ear pads prevent 90% of the noise from entering the ear canal. 【Transparent Mode】You can hear what you want to hear, which lets the outside sound in so you can hear and interact with the world around you. You can clearly hear the announcement from the airline or subway and what is said around you without removing the helmet. [Built-in Dual Noise Cancelling Microphone] The dual noise reduction system of the microphone suppresses the surrounding noise. An internal microphone and two dedicated external microphones pick up your voice and isolate it from outside noise. [One-step Pairing] Take the two earbuds from the charging case, and they will be paired automatically. Then simply turn on the Bluetooth connection on your mobile phone to pair the device with your headphones. [CHARGING ON THE GO] - A single charge allows TOZO NC9 wireless earbuds to work in playback for more than 10.5 hours and an extra 24 hours in the compact charging case. In active noise cancellation mode, the playback time can exceed 7 hours. Provides a convenient charging method without special conditions. [Suppression active du bruit] Suppression active du bruit hybride à 3 couches. 1. Le microphone orienté vers l'extérieur détecte les sons externes et les contre avec un anti-bruit égal pour annuler le bruit. 2. Le microphone orienté vers l'intérieur écoute le conduit auditif à l'intérieur pour capter les sons internes et produire à nouveau un anti-bruit pour doublement annuler le bruit résiduel. 3. Les coussinets empêchent 90 % du bruit de pénétrer dans le conduit auditif.