Features: 1Solution Distance Limit: Digital talkie modem hotspot box, interconnection with ordinary digital walkie talkie to achieve, to solve the ordinary digital walkie talkie pass through distance limit. 2Low BER: Modem hotspot box motherboard is made of excellent components, temperature complementary crystal, long time boot performance stability, low BER. 3Components Layout Perfect: Modem hotspot box duplex dual time slot digital hotspot this board optimization alignment, components layout perfect, low heat generation, fast heat dissipation. 4Dual Time Slot Advantage: Walkie talkie modem has the advantage of dual time slot, all debugging parameters are based on system carefully debug each board, the system after calibration will be more stable in use. 5Easy Setup: The modem is preloaded with software on the memory card. No need to set for RXOFFSET and for TXOFFSET, default 0 direct card, use the tool to write the software to the memory card. 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.) 1 x HotSpotDigitalModem