218mAh Rechargeable Battery for Sennheiser DW Office DW Pro 1 DW Pro 2 504374 | eBay
Battery for Sennheiser D10 DW Office DW Pro 1&2&30 DW SD Pro1 DW Reihe MB Pro 1&2 Li Po Rechargeable 504374 BATT 03 3.7V 200mAh|Digital Batteries| - AliExpress
Sennheiser DW Pro 1 Wireless Headset (DW20 HS) Headset Only not including charging base | HeadsetsOnly Australia
DW Pro 1 - Sennheiser - Wireless UC Headset
504460 - Sennheiser DW Pro1 20 ML - headset - Currys Business
Sennheiser DW BS PHONE EU 504446 w/ DW HS Pro 1 Headset DECT Telephony System | Other | Blackmore IT