Will it charge an Alpha 100 and a TT 15 at the same time?

Yes. That pairing is the main use case. Both devices draw from the same USB-C source, so expect a slower charge than charging them one at a time.

Does it work with older Garmin collars that use mini-USB?

No. Both ends are USB-C. Older mini-USB handhelds and collars need a different cable.

Can I use it with a phone charger or a car USB port?

Yes, as long as the adapter or port supplies enough power for two devices. A basic 5W phone brick will charge both very slowly.

If you already own compatible Garmin gear and want a backup cable for the truck, yes. It costs less than most single-device replacement cables.

The split adapter cable only. No wall adapter or cigarette lighter plug is included.

Where is the Split Adapter Cable cheapest?

At Best Buy, for $11.49, as of our latest check.

Where can I buy the Split Adapter Cable?

2 stores we checked sell it, including Best Buy, Red Fern Hound Supply.

Split Adapter Cable

Best price now

$11.49at Best BuyObserved at 12:12 PM

Compared across 2 stores. Prices are checked against each store and labelled with when.

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Our take on the Split Adapter Cable

A USB-C to USB-C power splitter that lets you charge two Garmin dog devices from one outlet or one car adapter. It is built for Alpha 100, TT 15, Delta, Delta Sport, Pro70, Pro550 and Pro Trashbreaker handhelds and collars. At $11.49 at Best Buy as of November 4, 2026, it sits at the low end of its recent range, and only two stores list it new.