HQRP Transmitter Battery for Dt-Systems DT Good Dog ST 100 Pro, ST 102 Pro, ST 200 Pro, ST 202 Pro, ST 300 Pro, ST 302 Pro Training Collar Transmitter + Coaster HQRP&reg; Rechargeable Transmitter Battery plus HQRP&reg; Coaster; Battery Voltage: 7.2V; Capacity: 350 mAh; Ni-Mh; 100% compatible with Original Battery; 200 Days warranty!