[Bluetooth 5.0 earphone] Redmi airdots 2 are equipped with Bluetooth 5.0 chips, for a data transfer rate up to 2 times higher than the previous generation, and a faster and stable connection, smoother for listening music and play. [Note: Our products are guaranteed to be 100% Authentic, the original package does not include the USB data cable][Wireless Stereo Headphones Noise Reduction] In-ear bluetooth provide stereo and monaural modes, They are equipped with 7.2mm dynamic unit and intelligent noise reduction system to enjoy sound quality. High fidelity sound, 4.1g lightweight design, perfect for running while listening to music. The phone activates Bluetooth for pairing, it is ready to use, and the headset can be used when taken out of the charging case.[Multifunction physical button / Sport headset with Microphone] With the high-quality bluetooth earphones equipped with a built-in microphone, you can easily make phone calls, The call quality signal is stable, is equipped with a multifunction physical button to reduce accidental keys and support voice control Double-click to activate the phones voice assistant, which is very convenient to use[Long battery life] Wireless earphone hours of battery life on a single charge, 12 hours of battery life with charging case, Headphones with 43 mAh battery, Charging case with 300 mAh battery. The charging box can charge the earphones twice[Waterproof sport earphone with 3 different sizes] bluetooth earbuds The most advanced bluetooth technology replaces traditional wired headsets, We offer you silicone tips in 3 different sizes (S, M, L), In-ear earphones which makes the headset stable and comfortable during mountain and other exercise