Feature: 1. NATIONWIDE INTERCONNECTION: By using a duplex hotspot board to achieve nationwide interconnection, the limitation of the connection distance of ordinary digital walkie talkies has been solved. 2. HIGH STABILITY: The hotspot board adopts imported components and temperature compensated crystal oscillator, with stable long term startup performance and low bit error rate. 3. LOW HEAT: Hotspot module has the advantages of optimized wiring, perfect component layout, low heat generation, and fast heat dissipation, making it suitable for long term startup work. 4. MULTI INTERFACE: The board is reserved with 2 organic light emitting diode screen interfaces and 1 NXT serial screen interface, which can be installed in multiple directions to make the screen more personalized. Which also reserves an external antenna interface. 5. MULTI MODE: With the advantage of for DMR dual time slots. All debugging parameters are fine adjusted based on for DMR system, which is more stable in use and improves the audio quality restoration. For other systems, users can adjust the frequency offset slightly and use stably in for DMR, D Star, YSF (C4FM), P25, NXDN, POCSAG and other modes. Specification: Item Type: Hotspot Board Material: PCB Frequency: U Band (420.000-434.900 438.100-470.00) Support Modes: For DMR, D Star, YSF (C4FM), P25, NXDN, POCSAG Power: 20mW Size: Length: Approx. 65mm/2.6in Width: Approx. 56mm/2.2in Support for Raspberry Pi: 2B, 3B, 3B+, 4B, for Raspberry Pi ZeroW (can be directly installed for Raspberry Pi, female header has been soldered) With Type C interface can support link computer with for BlueDV Hotspot Motherboard: Duplex. Package List: 1 x Hotspot Board2 x Antenna3 x Pin Header Note: This version needs to be used in conjunction with for Raspberry Pi.