Amazon.com: Sennheiser Presence Grey UC (508342) - Dual Connectivity, Single-Sided Bluetooth Headset for Mobile Device & Softphone/PC Connection, with Carrying Case and USB Dongle (Black) : Electronics
Sennheiser Updates Presence Range
Sennheiser Epos Presence UC Dual-Single-Sided Bluetooth Headset with Dongle | eBay
Sennheiser Presence UC Bluetooth Headphones Black | Techinn
EPOS/SENNHEISER ADAPT Presence Grey UC Bluetooth Headset 1000660