Supports , P-25, D-Star and System Fully tested Onboard LED to show status (TX, , PTT, Mode) SMA antenna connector, antenna included Mounts on all current for 's including the Pi Zero w /2W Only applicable to Mini Duplex MMDVM board To set the Pi star software and raspberry hardware (rpi 0-3), you need to delete the Right Socket for the new pi4b MMDVM_ General Pi star configuration of DUPLEX Set controller mode: duplex repeater or simple RF: Freq: 144-148219-225 (main frequency band) 420-475842-950 Duplex mode: Example: : 438.000000 TX: 433.000000 Duplex mode: Example: : 145.000000 TX: 433.000000 Simple mode: Example: : 438.000000 TX: 438.000000 Best adjusted: TX =0, =0,need no offset. Radio/modem type: STM32-DVM/MMDVM_ Aspberry pi Hat (GPIO) or any other (GPIO board) Antenna: on board two antennas :on board to show status, with status words on shell Update new firmware: (pi star/Expert/ssh access/: pi star pass: raspberry) sudo pistar-mmdvmhshatflash hs_ dual_ hat The default bit error rate is less than 5%, and the default offset is 0. If the bit error rate is 5%, as long as the signal can be received, it can be corrected through offset. color:White :PCB Package Contents: 1 x Hotspot board 2 x Row needle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.