Expand your GVT&B0EXP or your Dogtra TBDual to a 2-dog system or use this collar/beeper as a replacement
Compatible with Dogtra 2700T&B, 2702T&B, TBDual, TBDual-2, and Grain Valley-Exclusive GVT&B-EXP. Includes GREEN collar strap on black receiver/beeper.