I purchased this new from Amazon in 2021 to use with my Mac laptop while working from home. The SDW 30 headset and SDW 5 base station are in excellent condition (see photos).
At the time I also purchased a Jabra Engage 75 and preferred using the Jabra headset and base station over the Sennheiser, I stopped using both when I retired in 2025. Amazon still sells this for $239 (B07TV8JP8X).
I tested this headset recently using my Windows laptop and the latest EPOS connect software. The software recognized the USB-connected base station and headset, then updated everything to the latest firmware (base station and headset to 2.5.12, BTD 800 USB to 2.17.16). I verified that the headset audio worked in a Zoom call. The base station fully-charged the seated headset.
I don't have the original box or instructions anymore (can be downloaded from eposaudio.com website). I am including all the parts: (1) base station, (2) headset, (3) power cord/adapter, (4), USB cable (to laptop/PC), (5), telephone cord (for landline phone), (6) Bluetooth USB dongle (I didn't use this because my laptops already have Bluetooth, but it is inserted into the base station).
Shipping via USPS Ground Advantage.