Feature: 1. SOLVE DISTANCE LIMITATION: MMDVM simplex hotspot motherboard, which uses ordinary digital walkie talkies to achieve nationwide connectivity and solve the limitation of connectivity distance for ordinary digital walkie talkies! 2. STABLE AND RELIABLE: MMDVM motherboards all use premium components, temperature compensated crystal oscillators, stable performance after long term startup, and low bit error rate! 3. 2 PORTS: The board is reserved with two (old and new version interfaces) organic light emitting diode screen interfaces and one NXT serial port screen interface, allowing for more personalized screen installation in multiple directions! 4. STANDARD PRODUCTION: All debugging parameters are based on the for DMR system. Each board has been carefully debugged. The calibrated for DMR system will be more stable in use and have a significant improvement in sound quality reproduction. 5. IDEAL REPLACEMENT: Wonderful replacement for the old and damaged parts, fine workmanship, attention to details, helps you improve the working efficiency! Specification: Item Type: MMDVM Hotspot Module Material: PCB Frequency: U band (420.000 to 434.900/438.100 to 470.00/) Support Modes: For DMR, for D Star, for YSF (C4FM), for P25, for NXDN, for POCSAG Power: 20 milliwatts Product Size: Approx. 65 x 30mm / 2.56 x 1.18in(L x W ) Support for Raspberry Pie: for 2B, 3B, 3B+, 4B, for ZeroW Raspberry Pie (can be directly loaded with for Raspberry Pie, with the header already welded) For BlueDV with Type C interface that supports connecting computers Hotspot Motherboard: Simplexo'f. Package List: 1 x MMDVM Hotspot Module3 x Pin Header Note: This version needs to be used in conjunction with for Raspberry Pi.