Glsube is simply a different design on the belt! The sensor itself is the same.
The product here has lettering on the band. The product in your question has a completely black band
The heart rate belt from Polar works with Garmin sports watches, including the Garmin Fenix series. This is done via ANT+ or Bluetooth, which allows you to receive real-time data about your heart rate.
Yes, you can pair the heart rate monitor with the Apple Watch 9. The heart rate monitor supports Bluetooth Low Energy, which enables a connection to Apple devices.
It is safe with Suunto 5 and Suunto Spartan Sport (I have this combination) Check if the connection of the chest strap of Suunto9 and Suunto5 are identical. If they are identical, it should work.
According to this question in the Garmin forum, pairing is possible, but the recorded heart rate is only visible in the corresponding Polar app: https://forums.garmin.com/sports-fitness/healthandwellness/f/venu/246924/venu-and-polar-h10