HQRP Battery 2-Pack for Pet Stop Elite SW, Ultra Elite, Ultra Elite Series 2, Ultra Tuff Dog Fence Collar Receiver + Coaster HQRP&reg; Two Lithium Long Lasting Batteries plus HQRP&reg; Coaster; Battery Voltage: 6V; Capacity: 170 mAh; 100% compatible with Original Battery; Lasts 3-6 months, 30 Days warranty!