R21 & R21 Receivers. R22 & R22 Receivers. R51 & R51 Receivers. This high-performanceLi-MnO2 battery provides exceptional power and longevity, ensuring your system runs smoothly for longer. Banshee CS-IFR210SL 3V 150mAh Li-MnO2 Battery - Compatible with PetSafe & Invisible Fence Systems | 18-Month Warranty.
eBay