Replacement battery fits 14 TechniSat compatible models. Specifications: 350mAh, 3.7V, Li-Polymer. Compatible with: Sonumaxx 2.4 range, Sonumaxx 2.4 PR Receiver, STEREOMAN ISI V2, STEREOMAN 0000/9128, STEREOMAN 0001/9128, Stereo ISI 2 and 8 more compatible models. Replaces: Sonumaxx 230-469, STEREOMAN MLP503131P, STEREOMAN 202411W. TechniSat replacement battery designed for Headset devices.