The Mi True Wireless Earphones 2 deliver a clear, detailed sound and enhanced bass response, ensured by tuned driver and leading-edge wireless technologies that include Bluetooth 4.1 and CSR chip for decent Hi-Fi sound. The earphones combine a classic design noise reduction, giving you premium sound quality and maximum comfort. They produce exceptional frequency response for an enhanced listening experience and create a better sound isolation and minimal external sound interference. Their water-resistant Nano-coating efficiently protects sport headphones from sweat and ensures a longer life span. They have a quick and automatic pop up pairing. The Mi True Wireless Earphones 2 are fast changing and have a long battery life.