Feature: 1. Excellent Components: This MMDVM hotspot spot radio station is made of excellent components, with temperature compensated crystals, stable performance over long periods of time, low BER, and support for simplex mode. 2. 3.5 Inch Colour Screen: This MMDVM hotspot board digital voice modem features a 3.5 inch colour screen with a clear display that allows you to get a more accurate picture of what is going on. 3. Good Performance: This MMDVM digital voice modem has good performance, adopts optimised alignment, perfect component layout, low heat generation, fast heat dissipation and other advantages, which is suitable for long time power on work. 4. DMR System: All the debugging parameters of this MMDVM hotspot board are based on the DMR system to carefully debug each board, after the calibration of the DMR system will be more stable in the use of the sound quality reproduction is greatly improved as for other systems users only need to do a little bit of trimming the frequency deviation can be used in the DMR, D Star, YSF (C4FM), P25, NXDN, POCSAG mode on the same stable. 5. Wide Application: This MMDVM simplex hotspot module has a wide range of applications and can be used for digital data transmission, digital voice communication, remote control, digital voice gateway and so on. Specification: Item Type: MMDVM Digital Voice Modem Material: PCB, Acrylic Frequency: U Band (420.000-434.900, 438.100-470.000) Supported Modes: DMR, D Star, YSF(C4FM), P25, NXDN, POCSAG Power: 20mW Screen: 3.5 Inch Color Screen Power Supply: External Mini (for Android) Port 5V 2A (Power Supply Not Included) Memory Card: 16GB Memory Card (Shipped with Memory Card) Main Board: For Pi ZeroW, MMDVM Simplex Blue Board Hotspot Board: Simplex. Package List: 1 x MMDVM Digital Voice Modem 1 x Antenna