This product is either discontinued or we cannot get that from suppliers.
Brand: Garmin, Model: 010-13087-01, Type: Cable, Colour: Black, Compatible: Tread - Overland Edition / Tread - SxS Edition / Tread XL - Overland Edition.
Use this bare wire power cable with your Group Ride Tracker (required; sold separately). The cable has a 2-pin connector.