Support aptXOnly 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 5.0Faster transfer speed, better sound transmission, pairing with IOS and Android smart phones in a short time Gold Plated Audio ConnectorDifferent from others, YOCOWOCO wireless adapter choose the gold plated audio connector for better signal conductivity and extraordinary listening experience Professional DesignThe internal 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. WarrantyIf there are any issues for the product, please feel free to contact us for the warranty.