Wireless Pro&reg; Premium Replacement Rechargeable battery for Sennheiser Wireless Headsets - OfficeRunner DW Office DW Pro1 DW Pro2 SD Office SD Pro1 SD Pro2 MB Pro series - Li-Polymer 240mAh - 1PK No more interrupted conversations when calls will now last 1.5 to 2 times LONGER than the OEM battery and recharges faster. Talk longer and close more sales! Our replacement battery is the PERFECT FIT for your Sennheiser wireless headset at home or the office! Dont get cut off your next important call! Other replacement batteries arent made of LONG LASTING Lithium Polymer and dont match up to our specifications of 240mAh 3.75v. 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. Avoid trying to constantly recharge your headset or if its time to get a new battery dont hesitate to click ADD TO CART today! Also remember to get one for your home and another for your office headset system and rest assured of products are back with a 1 YEAR UNCONDITIONAL Replacement Warranty!