Amazon.com: Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones : Electronics
Sennheiser BTD 600 Dongle | eBay
Brand New Sennheiser BTD 600 Bluetooth Dongle - USB-A/USB-C Adapter | eBay
Amazon.com: MMCX Bluetooth Wireless Adapter Cable with Microphone and Controller for Sennheiser IE300 IE600 IE900, 20 Hours Play Time, Lossless Sound Quality : Electronics
Amazon.com: Sennheiser Consumer Audio BTD 600 Bluetooth® Dongle - USB-A/USB-C Adapter with AptX Audio Codecs for Stable, Sound - Listen to Music, Make Calls, and Watch Videos : Electronics
Sennheiser GSA 70 Dongle Bluetooth Adapter Black | Techinn
Unlock Wireless Audio Power with Sennheiser BTD 600 Bluetooth Dongle – BrandsWalk
Mitel Compatible Cordless SDW 5016 Headset Bundle with Mitel EHS Adapter - Global Teck
Sennheiser IE PRO BT Bluetooth Connector IE PRO BT CONNECTOR B&H
BT T100 Bluetooth® Audio Transmitter – Sennheiser
Poyatu Bluetooth Adapter Receiver for Sennheiser Momentum and Momentum 2.0 On-ear Over-ear Headphone Wireless Upgrade Cable - AliExpress
Sennheiser TV Clear Set 2 True Wireless In-Ear Advanced TV listening With 5 Speech Clarity Levels And TV Connector Black TV Clear Set 2 - Best Buy
Sennheiser IE 400 PRO in-Ear Headphones for Wireless Monitoring Systems with Mackie MP-BTA Bluetooth Adapter (Black)
Amazon.com: VOXOA BTunes Wireless Bluetooth Adapter for Sennheiser HD518/558/598/569/579/599