Yes, the strap works with any Bluetooth-enabled watch and can be paired accordingly.

How do I do that? At the moment I'm using the Garmin strap with a Garmin watch, but how do I do it if I want to connect the strap to the Apple Watch? Because I have the feeling that the strap is only on when I start an activity on my watch and there is no on or off switch on the strap and it doesn't appear with Bluetooth either