Antenna and Al Case and OLED and 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 raspi Setting For Pi-star software and for raspberry hardware (rpi 0-3) new pi4b need remove R1 Resistor. Controller Mode:Simplex Node Radio Frequency : Freq:144-148,219-225,(Main Band)420-475,842-950 Example:438.000000 Radio/Modem Type:STM32-DVM(GPIO) Quick start: 1.download image https://.pistar.uk/downloads/ write it to card 2.insert card to rpi 3.wait to boot 5 minutes connect wifi Pi-star-setup pass raspberry 4.open http://pi-star/admin/ 5.set freq,dmr id,dmr mode,add home's wifi ssid... Colour:As Shown Material:ABS Package Contents: 1 set x Hotspot Antenna 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 picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.