Features 1.APPLICABLE MODEL: MMDVM mini hotspot repeater board, duplex dual time slot design, mainly used for the built in extension board for Raspberry Pi 3B. 2.WITH COOLING FAN: The hotspot board has mini cooling fan for easy operation for long periods of time, and the acrylic case adds elegance to the product. 3.MEMORY CARD: Including 16G or 8G small memory card, the writing speed is not less than 10M, which has high efficiency and good durability. 4.GOOD PERFORMANCE: The digital hotspot board has the advantages of optimized wiring, perfect component layout, low heat generation, fast heat dissipation. 5.DMR STANDARD: All debugging parameters are carefully debugged according to the DMR standard, more stable in use and greatly improve the sound restoration. Specification Item Type: Duplex Hotspot Board Product Material: Acrylic, ABS Frequency: U Band (420.000-434.900, 438.100-470.000) Power: 20mW Support Modes: DMR, D Star, YSF(C4FM), P25, NXDN, POCSAG Package List 1 x Hotspot Board 2 x Antennas