Features: aptX Adaptive low latency mode / Qualcomm flagship chip / coaxial dual moving coil unit / 9 hours long battery life / fast charging, 10 minutes of charging, 2.5 hours of playback aptX Adaptive low-latency audio and video game audio and video synchronization The new Qualcomm R aptX Adaptive dynamic low-latency technology, with a delay as low as 80ms, can be automatically adjusted according to the content of the device to provide better sound quality or lower delay, bringing an excellent wireless listening experience for audiovisual and gaming. Qualcomm's flagship Bluetooth chip creates an excellent wireless experience Bluetooth headset Line Free uses Qualcomm's QCC5125 flagship chip, supports Bluetooth 5.0 technology*, has a larger transmission bandwidth, a more stable signal, and can transmit more sound details. Coaxial double moving coil unit releases pure and natural sound Built-in 9.2mm double-moving-coil acoustic unit, with independent cavity, coaxially placed front and rear speakers, avoiding the problem of frequency band crosstalk, releasing three-band balanced, clear and pure sound, just like seeing every music that touches the heartstrings. on site. aptX Advanced Codec* Lossless Music Comes Here The apt advanced audio codec has the ability to restore the sound with the smallest detail. The sound source file is compressed at a high bit rate through the algorithm, and then it is completely restored to the earphone for playback. The subtle details are also presented, allowing you to do so at any time. Listen to lossless high-fidelity music. HD stereo True reproduction of the full audio bandwidth, bringing a consistent Bluetooth stereo listening experience Immersive experience Even for standard resolution audio, it can also enhance audio effects 9 hours long battery life "musicmovement" worry-free The low-power Bluetooth solution, coupled with high-performance batteries, enables the Xiaomi Bluetooth headset Line Free to have up to about 9 hours of listening time*, which will accompany you every moment, whether it is music or sports, without any worries. Fast charge Charge for 10 minutes, play for about 2.5 hours Bluetooth headset Line Free uses 3C high-voltage lithium-ion battery, with built-in power management chip and high-speed type-c interface, charging for 10 minutes, you can listen to music for about 2.5 hours. DSP+cVc call noise reduction quietly enjoy binaural high-definition voice DSP digital noise reduction combined with cVc software algorithm noise reduction brings a 1+1>2 deep noise reduction effect, which can clearly record human voices, intelligently identify and offset various environmental noises. No matter where you are, you can quietly enjoy binaural high-definition calls by wearing headphones. Titanium alloy memory metal cable is flexible and durable, comfortable to wear The neckband uses a highly elastic memory cable, which has excellent flexibility and durability, and can be bent and stored in a bag at will. The cable feels warm and delicate, even if you wear it for a long time, there is no burden, and it is as comfortable as customization. 360 arbitrary bending, high elasticity without deformation, convenient to carry The touch is warm and delicate, comfortable to wear, without burden Product parameters: Wireless connection: Bluetooth 5.0 Product weight: 25g Communication distance: 10 meters (barrier-free open environment) Battery capacity: 100mAh Music time: about 9 hours Charging time: about 1 hour Standby time: about 200 hours Battery type: lithium ion polymer battery Bluetooth protocol: HFP/ A2DP/HSP / AVRCP List Headphone*1 Charging cable x1 Ear caps3 pairs (S/M/L, M is pre-installed) Instruction Manual x1