Plantronics/Poly Calisto 5300-M with USB-C BT600 dongle The Calisto 5300 USB and BT Speakerphone connects to a PC, laptop or Mac via a BT600 USB dongle; to mobile phones or tablets via Bluetooth Standard USB-C dongle connection. This version is certified for Teams , but also works with other major platforms (has Teams button on speaker as shortcut to connect to Teams)