Antenna + Al Case + OLED + hotspot Support P25 DMR for 1.Hardware add (SDA,SCL)R20,R21 Connect stm32 i2c 2 bus to OLED,and raspi. oled message pwr on without RPI using mmdvm_hs custom fw,and i2c 2 bus.2.Support i2c communition with raspiSetting For Pi-star software and for raspberry hardware (rpi 0-3) new pi4b need remove R1 Resistor.Controller Mode:Simplex NodeRadio Frequency : Freq:144-148,219-225,(Main Band)420-475,842-950Example:438.000000Radio/Modem Type:STM32-DVM(GPIO)Quick start:1.download image https://.pistar.uk/downloads/ write it to card2.insert card to rpi 3.wait to boot 5 minutes connect wifi Pi-star-setup pass raspberry4.open http://pi-star/admin/5.set freq,dmr id,dmr mode,add home's wifi ssid...Colour:As ShownMaterial:ABSPackage Contents:1 set x Hotspot AntennaOnly 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.