Presence Grey UC Bluetooth Headset w/Dongle by Sennheiser | Business Telecom Products
Sennheiser BT800 USB Bluetooth Adapter
Amazon.com: VOXOA BTunes Wireless Bluetooth Adapter for Sennheiser HD518/558/598/569/579/599 : Electronics
POYATU aptX HD599 Bluetooth Adapter For Sennheiser HD599 HD579 HD569 Wireless Adapter Receiver Bluetooth Cable Cord|Wireless Adapter| - AliExpress
Bluetooth Adapter USB Bluetooth 5.2 Transmitter QCC3040 Chip Free Drive Suitable for Game Console Computer|USB Bluetooth Adapters/Dongles| - AliExpress
EPOS | BTD 800 USB-C from EPOS
POYATU aptX HD599 Bluetooth Adapter For Sennheiser HD599 HD579 HD569 Wireless Adapter Receiver Bluetooth Cable Cord|Wireless Adapter| - AliExpress
Sennheiser BT T100 Bluetooth® Audio Transmitter - - Sennheiser's new BT T100 Bluetooth® audio transmitter lets you easily upgrade your existing equipment to experience all the freedom and convenience of wireless sound.
Sennheiser BTD800 USB Bluetooth Dongle - HAB Hearing
Sennheiser BTD 500 USB Dongle Wireless Bluetooth Adapter (BTD500 USB)
EPOS Sennheiser MB 660 UC - ANC Bluetooth Headset - Includes USB Dongle
Bluetooth dongle
Sennheiser EPOS BTD 800 USB ML Bluetooth Dongle
Sennheiser BTD500 USB Wireless Bluetooth Dongle
Amazon.com: BTD 500 USB Dongle : Electronics
Sennheiser BTD 800 USB - Network Adapter - USB 2.0 - 1000227
Epos / Sennheiser Adapt BTD 800 USB ML Dongle 1000227