The headset has a built-in Bluetooth 5.0 chip to be called a new generation of headphones. Redmi AirDots is equipped with the latest Bluetooth 5.0 chip, the data transfer rate is up to 2 times compared to the previous generation, the connection is faster and more stable. Listening to music and playing is smoother and softer Noise Reduction of 7.2mm Moving-Coil Drive Unit and DSP Intelligent Environment Noise Reduction: when material and setting are the same, the larger the size of the speaker unit, the better of the low frequency The Redmi AirDots are equipped with a 7.2 mm sound unit, which has a low-frequency dip and a medium to high frequency. Free to adjust, comfortable to wear, not easy to fall Lightweight and comfortable to wear is the highlight of Redmi AirDots Thanks to the strict weight control of the single headset at 4.1 g. You do not have to worry about it falling down We have prepared 3 models of ear protectors to meet your highest demands of closure and firmness, even when running, punching and listening to music. 4 hours battery life with charging box. Using the time extends to 12 hours.