Speakerphone size: (Ø) 132.5 x (h) 35.5mm, Speakerphone weight: 320g, Buttons: 8 touch buttons, Connectivity: USB 2.0 PNP & Bluetooth, USB cable length: 0.9 meter, Connectivity: Built-in Bluetooth 4.0, Wireless range: 30 m, Power: USB/Lithium Polymer Battery, Battery Capacity: 3.85V/2450mAh, Charging time/power: 5 hours (USB 5V/500mA), Talk time: 12 hours, Standby time: 450 day. The Yealink TEAMS-CP900-BT is a high-performance & portable CP900 Teams Edition Speakerphone with BT50 Bluetooth Dongle that is flexible and scalable for the meetings of up to 6 people.