Sennheiser RR820 / RR820S / RR2500. Sennheiser HDR4 / HDR6 / HDR45 / HDR60 / HDR65 / HDR80 / HDR85 / HDR400. Enhanced Audio Experience: Ensure uninterrupted and high-quality audio with this battery designed for Sennheiser models BA150, BA151, BA152, A200, HDI302, and IS150.
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