It is an simplex modem hotspot box. Through it, you can use ordinary digital mobile radios to achieve nationwide interconnection, which solves the limitation of the communication distance of ordinary digital walkie-talkies! PI-STAR system makes it convenient for your habits. The motherboard is designed with all components and TCXO. After a long time of booting, its performance can also remain stable, and the bit error rate is low! This is the new version of digital hotspot. We have optimized the wiring for the board. The component layout is perfect, the heat generation is small, and the heat dissipation is fast. : Frequency: UHF (420.000-434.900/438.100-470.000MHz) Supported modes: DMR, D-Star, (C4FM), P25, NXDN and POCSAG Power: 20mW Housing material: Acrylic Screen: 0.96 inch OLED External power supply: Mini port (for Android) / Type-C port, 5V 2A (prepare power supply by yourselves) Pi motherboard: For Zero W Hotspot motherboard: simplex Note: System card is not included in the package. (Different batches may have different appearance, which does not affect use) Material: PCB+electronic components+acrylic colour: Transparent + Blue Package Contents: 1 x Hotspot box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.