Fits your device: compatible with Sennheiser HD 4.40 BT Technical data: 600mAh, 3.7V, Lithium-Polymer; rechargeable, charges as usual in the dock or via the headphone's charging cable; sets for two earpieces include the matching number of cells Fits the listed models: switch the device off, remove the old battery and insert the new battery the same way round In the box: Battery Before purchase, compare the device model with the compatibility list; the model number is usually printed on the original battery or inside the battery compartment
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