You can upload your activities to Strava from CATEYE Sync
Launch CATEYE Sync and select your device (Strava supports the STEALTH Series).
Connect your CATEYE device to your computer.
From here, you can download your activities to CATEYE sync.
Once you've downloaded activities to CATEYE Sync you can press the "Upload to Strava" button to share any activities you've selected. The first time you do this you will have to sign into Strava and authenticate the software.