The Stem Hub can connect up to 10 devices per room and is required when using more than one Stem device. Multiple connectivity options are available including USB Type-B for use with a computer Dante VoiP and terminal block for external speakers. The unit cannot be used as a standalone device. With a sleek and low-profile design the Stem Hub discretely mounts on a wall. It comes with a Kensington lock so you can keep it secure in your conference room.