I found this old Garmin transmitter with "HRM-SS, ANT+" on the back amongst all my bike and run equipment. What can I use it with? It doesn't connect to my Garmin VA4. Would it be useful for Zwift or a Garmin 830 bike computer? I'm assuming I had to upgrade to a HRM-dual because this one didn't work with some of these things, but can't find any info online about the HRM-SS.