Colour: Black, Cable length: 150mm±30mm, Line sequence: From Q01 to Q03, Interface: RJ9 Socket (4P4C) and RJ9 Plug (4P4C), Working Temperature: 0-45°C, Working Humidity: 20-85%. The Fanvil T03 is compatible with all Fanvil handsets and is for Sennheiser headsets. It is plug-and-play and is easy to deploy.