The Garmin USB Cable can be used to provide external power to compatible devices. It is compatible with Astro 320, Astro 430, Astro 900, Alpha 100, T 5, T 5 Mini, T 5X, TT 15, TT 15 Mini, TT 15X, Delta Trainers & Dog Devices, BarkLimiter Deluxe, Sport Pro and Pro 550 Plus.

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