Compatibility: 20 Pack 6 Volt RFA-67 RFA-67D-11 batteries, 100% compatible with PIF-300 RF300 PIF-275-19 PRF-3004W PUL-250. Durable Battery: RFA-67 collar replacement batteries provide up to 30 months of use and have a long shelf life. Waterproof: Your pet can play as much as you want, get wet on the grass, play in the rain or swim in the creek, and you can spend a good day with your cute pet. Easy Installation: Simply use a screwdriver or coin to remove the old battery. Put new battery in place and turn clockwise until secure, very convenient for daily use. Services: 30 Days Refund & 365 days after-sales service. 24H Promptly and Friendly Response (Weekdays). LP RFA-67 RFA-67D-11 Pet Collar Replacement Batteries, 20 Pack 6 Volt Lithium Battery Compatible with PIF-300 RF300 PIF-275-19 PRF-3004W PUL-250