Stable connectivity: Xiaomi Redmi Buds 4 Active use Bluetooth 5.3 for lower latency and more stability. Experience Powerful Bass:With a 12mm dynamic coil and a double-layer polymer composite membrane, it delivers enhanced bass and heightened acoustics, allowing you to discover more details in your music. Noise cancellation：Each earbud is equipped with a high-sensitivity microphone that reduces interference from ambient background noise, ensuring optimal speech intelligibility for effective communication even in noisy environments. Touch function: Answer incoming calls, play music and other daily operations can be done with a single touch of finger on the back of the headset, long press with two fingers on the headset can start playing mode and turn on and off the low latency function. Long battery life: The battery life of the earphones can last up to 5 hours on a single charge, and up to 28 hours with the portable charging case, and can be used for two hours after charging for 10 minutes.