Feature: 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 Note: Please pay attention to screen safety when using.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.