AXIS F9104-R Mk II is a 4-channel main unit part of the F-series. 4x F21, F72 or F41 sensor units can be connected to it. It also has 1x 10-48V DC port and 1x USB A port. It has an Ethernet port and PoE Class 4. Max 25,5W. AXIS TU6001 Connector 3-in (for the DC port) has to be purchased separately.