Compatible with:
Sennheiser Headphones IS 410, IS-410, IS-4200, IS410, IS410 TV, IS410TV, IS4200 RI 410, RI-410, RI410, RI830, RI830S, RI900 RR 4200, RR4200 RS 4200, RS 4200 TV-2, RS-4200, RS4200, RS4200TV, RS4200TV-2 SET 830, SET 830-TVSET 840, Set 840, SET 900Replaces the original battery:
Sennheiser BA 300, 500898, HC-BA300