Yealink TEAMS-BH72-BL-C USB Wireless Stereo Headset, Black, Connectivity Bluetooth, Wireless Up to 100 ft, Mono/Stereo, On Call Indicator, Talk time Up to 35 hrs, Speaker Size 35mm. The Yealink BH72 Bluetooth Headset Series, includes the entry-level (lite) model, alongside the wireless charging full functionality BH72 Bluetooth headset.