Garmin Alpha TT25 Tracking CollarGarmin TT25 Collar Compatibility: ALPHA 300i 300 200i 200 100 10 PRO 550 PLUS (limited to 2. 5 second update rate only, default beacon light color) ASTRO 430 (tracking function only) NOT compatible with Astro 320 or 220 handhelds Garmin TT25 Standard Battery Life (included): Up to 68 hours using dynamic tracking (default) Up to 25 hours with location updates every 2. 5 seconds Up to 84 hours with location updates every 2 minutes
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