Prebuilt Hotspot ready to go:
 
MMDVM
Frequency: U segment (420.000-434.900/438.100-470.000)
Support modes: DMR, D-Star, YSF(C4FM), P25, NXDN, POCSAG
Power: 20 mW
Size: small board length 65mm*width 30mm, large board 65mm*width 56mm
Support Raspberry Pi: 2B, 3B, 3B+, ZeroW 
Hotspot Motherboard: Simplex/Duplex
Imported Crystal