Fit Device Model: Tonie Box Speaker Battery Part Number: 50AA5S Battery Specifications: Type: Ni-MH, Capacity: 2000mAh, Voltage: 3.6V, Dimension: 52.10 x 43.50 x 15.00mm Qualification: Certificated with ISO9001, RoHS, CE, UN38.3,and MSDS After-Sale Service: We promise full refund or a Free Replacement without Reason for 60 Days and 1-year warranty.