Sennheiser Rechargeable Battery (BA-300) Disposable Curettes Can be used with optional

Can be used with optional loop receivers

Separate size slot for each type of battery

It can also be hardwired to your audio alarms that comes with connecting terminals for direct activation

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Sennheiser Rechargeable Battery (BA-300) Disposable Curettes Can be used with optionalLithium polymer rechargeable battery suitable for: Set 900, RI 900, Set 840 TV, RR 840, Set 840 S, RR 840 S, Set 830 TV, RI 830, Set 830 S, RI 830 S, IS 410, RI 410, RS 4200, RR 4200, HDI 830. **THIS PRODUCT HAS BEEN DISCONTINUED If your current model is one of the above listed, we highly recommend the current, Sennheiser Set 860 linked HERE