Replacement battery fits 5 Microtac compatible models. Specifications: 700mAh, 4.8V, Ni-MH. Compatible with: Infinity SA9800, ThoughtTech MyoTrac, ThoughtTech U-Control Infiniti encoders, ThoughtTech Myotrac Infiniti, ThoughtTech Myotrac Infiniti U-Control. Replaces: Microtac MED585, ThoughtTech MI1027. Microtac replacement battery designed for Medical devices. Designed for long-lasting power.