Sennheiser Replacement Rechargeable Battery for OfficeRunner Wireless Headset DW Office DW Pro1 DW Pro2 SD Office SD Pro1 SD Pro2 MB Pro series Li Polymer 205mAh (3 Pack) IDEAL for: OfficeRunner, DW Office, DW Pro1, DW Pro2, DW Pro2 ML, DW Office ML, SD Office, SD Office ML, SD Pro1, SD Pro1 ML, SD Pro2, SD Pro2 ML, MB Pro series Manufacturer authorized battery Easy Installation High Quality German engineering