Hotspot Walkie Talkie Modem 1.3in Organic Light Emitting Diode Hot Spot Duplex Digital Walkie Talkie Modem Box Orange Item Type: Digital Walkie Talkie Modem Material: ABS Frequency: U Band (420.000-434.900 Or 438.100-470.000) Support Mode: D Star, YSF (C4FM), P25, NXDN, POCSAG Power: 20 MW Screen: 1.3 Inch Organic Light Emitting Diode Power Supply External: MINI ( for Android) Port 5V 2A (Self Powered) Motherboard: For NanoPi Duo2 Hotspot Motherboard: Duplex Memory Card: 16G (Shipped With Memory Card) Duplex: Duplex box can be like a relay 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 it uses mode to talk simultaneously 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.)