Supports DMR, P-25, D-Star and System Fusion Fully tested. Onboard LED to show status (TX, RX, PTT, Mode) Mounts cleanly on all current Raspberry Pi's including the Pi Zero W 2W/3B/4B WIDELY COMPATIBLE: Supports DMR, P-25, D-Star and System Fusion WORK with RASBERRY Pi: Mounts cleanly on current Raspberry Pi including the Pi Zero W 2W/3B/4B.Mode: Support both Duplex mode and Simplex mode Differencs in Duplex and Simplex:in Duplex mode,have 2 time slots, and Tx and Rx can do at the same time Radio Frequency : in duplex mode,support uhf 430-440MHZ, in simplex mode support both uhf 430-440MHz and vhf 140-150MHz Best adjusted: TX =0, RX=0,need no offset. Modem select: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO) Aluminum alloy shell:High RF performace LEDs:on board leds to show status, with status words on shell How to write WiFi detail into the Hotspot: Method 1: Generate WiFi config file, and plug it into TF card. We need a TF reader.Put our TF card into this TF reader and plug this into our computer. Go tohttp://www.pistar.uk/wifi_builder.phpand then fill your WIFI name into the SSID, password into the PSK, click submit. Then the file wpa_supplicant.conf is generated. Drag this file into your TF card's boot path. And plug the card into your hotspot. Power up your hotspot, and wait for 1-2minutes.Then we go tohttp://pi-starand play with the settings. Please keep this in mind that gadget only support 2.4 Gigahertz router, and it does not work with 5.8G router. Colour:white+black Material:PCB+electronic components+aluminum alloy