The Tri-Tronics Electronic Dog Collar Battery Fits most Tri-Tronics PRO series, Beagler, Flyway, Classic / Field 70, Upland Specials, Trashbreaker Ultra II, and Trashbreaker Ultra collars. Including the Pro 100, 200, 500, Flyway, Upland Special, Beagler, (XL, XLS and non XL models), the Classic and Field 70, Trashbreaker Ultra II, and the Sport 50, 60, 65 BPR and Multi-Sport models.
NiMH battery. One required for XL, XLS and Sport Series S
models. Two required for Pro Control.