CompatibilityOnly fit for Bose QuietComfort 3QC3headphones. Don't fit for any other headphones Support aptXThis wireless bluetooth 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 Professional DesignBuilt-in Mic could pick up your voice clearly and gives you a good communication experience. Three buttons on the adapter make it easy for play/pause, answer/drops calls and volume adjustment. No need to remove the adapter from your headphones when charging. NoteYOCOWOCO QC3 Bluetooth adapter can pair with the headphones even when theyre powered off. To get started with wireless audio, simply turn on your Bose headset by sliding the power button to the ON position to power it on. WarrantyIf there were any issue for the product, pl