Feature: 1. FUNCTIONS AND EFFECTS: MMDVM digital language modem(hotspot) box with common digital language to achieve national interconnection, solve the common digital language communication distance limit 2. STABLE WITH LOW ERROR: All MMDVM motherboards adopt imported components, warm crystal vibration, possess stable startup performance for a long time, with low bit error rate 3. GOOD HEAT DISSIPATION: The MMDVM duplex dual slot digital hotspot board has optimized cable routing, with perfect component layout, low heat generation, fast heat dissipation, and other advantages, suitable for long term startup 4. ACCURATE MODULATION: Duplex board has the advantage of double time slots for DMR. All debugging parameters are carefully calibrated according to for DMR standard. The calibrated for DMR standard will be more stable in use and greatly improve the sound quality reduction 5. APPLICABLE MODEL: As for other system, users can use the same stability in for DMR, D Star, YSF(C4FM), P25, NXDN, POCSAG model just with a little adjustment Specification: Item Type: MMDVM Case Model Number: I7 Frequency: U segment(420.000-434.900/438.100-470.000) Supported Modes: For DMR, D Star, YSF(C4FM), P25, NXDN, POCSAG Power: 20mW Product Size(LxWxH): Approx. 120 x 77 x 43mm / 4.72 x 3.03 x 1.69in Screen: 3.5in color screen Power Supply: 2 x 7V 18650 lithium battery 1500MAH Heat Dissipation Mode: Active temperature control fan(50℃ on or 40℃ off) System Motherboard: For NanoPi Duo2 Hot Motherboard: Duplex. Package List: 1 x MMDVM Case