Hello, thank you for your review. If you're having trouble pairing your headphones with your iPhone, try resetting your headphones, see. link here: https://www.intezze.com/sites/default/files/soubory/2024/02/core-reset. pdf.
As for the issue of pairing with a Garmin watch, the headphones don't have a Multipoint feature - which allows them to be connected to multiple devices at the same time. You need to turn off Bluetooth on the paired device, and then you can connect to the next one. If the problems persist, contact the manufacturer's customer service
[email protected], they will be happy to advise you and help you solve the problems. Thank you and have a nice day, Ondřej - Alza expert.