【Support aptX】Only fit for Bose QC25 headphones. This upgraded adapter supports aptX which gives you a near-lossless music . Please note that aptX technology is available when the paired device also supports aptX | 【Advanced Bluetooth 5.0】Faster transfer speed, better sound transmission, pairing with IOS and Android smart phones in a short time | 【Gold Plated Audio Connector】Different from others, YOCOWOCO wireless adapter choose the gold plated audio connector for better signal conductivity and extraordinary listening experience | 【Professional Design】Built-in Mic could pick up your voice clearly and gives you a good communication experience. Fours buttons on the adapter make it easy for play/pause, answer/drops calls and volume adjustment. Situated in the hidden place, effectively prevent dust and damages. Please remove the adapter from the headphone before charging | 【Warranty】If there are any issues for the product, please feel free to contact us for the warranty.