Supports DMR, P-25, D-Star and System Fully testedOnboard LED to show status (TX, RX, PTT, Mode)SMA antenna connector, antenna includedMounts cleanly on all current for 's including the Pi Zero w /2WOnly applicable to Mini Duplex MMDVM boardTo set the Pi star software and raspberry hardware (rpi 0-3), you need to delete the Right Socket for the new pi4bMMDVM_ General Pi star configuration of DUPLEXSet controller mode: duplex repeater or simpleRF: Freq: 144-148219-225 (main frequency band) 420-475842-950Duplex mode: Example: RX: 438.000000 TX: 433.000000Duplex mode: Example: RX: 145.000000 TX: 433.000000Simple mode: Example: RX: 438.000000 TX: 438.000000Best adjusted: TX =0, RX=0,need no offset.Radio/modem type: STM32-DVM/MMDVM_ Aspberry pi Hat (GPIO) or any other (GPIO board)Antenna: on board two antennasLEDs:on board leds to show status, with status words on shellUpdate new firmware: (pi star/Expert/ssh access/user: pi star pass: raspberry)sudo pistar-mmdvmhshatflash hs_ dual_ hatThe default bit error rate is less than 5%, and the default offset is 0. If the bit error rate is greater than 5%, as long as the signal can be received, it can be corrected through offset.color:WhiteMaterial:PCBPackage Contents:1 x Hotspot board2 x Row needleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.