Keep your pet's training on track with this 8 Pack of Enerpe Power Pet Collar Batteries. Specifically designed for R21, R22, and R51 MicroLite Receivers, these 3V batteries ensure long-lasting power for your electronic fence system. Perfect for dog owners looking to maintain a reliable and effective containment solution, these replacement batteries are a must-have for any pet owner. Stay prepared and keep your pet safe with these high-quality batteries from Enerpe.