Vivtone Supermini Hearing Aids (Not Amplifiers), TM-S-b25 TM-S-b25 TM-S-b25 Batteries 1 A batteries required. (included) Manufacturer Vivtone Item model number TM-S-b25 Package Dimensions 6.3 x 3.98 x 1.85 inches; 8.47 ounces