EPOS BTD 800 USB-C. Host interface: USB Type-C, Bluetooth profiles: A2DP, Transmission distance: 25 m. Power source: USB. Width: 27.5 mm, Depth: 7.5 mm, Height: 23.5 mm. Package type: Box. Master (outer) case width: 340 mm, Master (outer) case length: 255 mm, Master (outer) case height: 285 mm