Duplex Hotspot Motherboard with 2 Antenna Type C Radio Frequency Connector Motherboard for Digital Modem Box Item Type: Duplex Hotspot Motherboard Material: PCB Frequency: U Band (420.000-434.900 Or 438.100-470.00) Support Mode: D Star, YSF(C4FM), P25, NXDN, POCSAG Power: 20mW Supported for Raspberry Pi: 2B 3B 3B+ 4B ZeroW (Can Directly Install for Raspberry Pi, Row Pins Are Already Soldered) For BlueDV with Type C interface can be used to connect to a computer Duplex: The duplex box can be like a repeater station. Cellular radios need to be set up with different transmit and receive frequencies. A duplex box works like a multimode digital repeater station. The advantage of a duplex box is that the modes are used to talk at the same time without interfering with each other. One box can monitor two groups at the same time, and both groups can talk at the same time without interfering with each other. (The dual panel can also be set to single sided.)