Feature: 1. 32 BIT PROCESSOR: High performance 32 bit ARM processor after fully tested. Supports DMR, P25, D Star and system integration 2. LED DISPLAY: Onboard LEDs show status, possess Tx, Rx, PTT Mode, suitable for P25 DMR YSF NXDN for Raspberry Pi and OLED 3. DUPLEX DUAL ANTENNA: RF power up to 10mW, SMA antenna connector, including dual antenna, realize real duplex, very practical 4. FOR RASPBERRY PI ALL CURRENT MODELS: MMDVM hotspot board can be installed cleanly on all current for Raspberry Pi, including for Pi Zero 5. SUPPORT OPEN SOURCE 3D PRINTING: MMDVM hotspot module providing open source 3D printing cases, such as UHF 430‑450MHz, 433mhz and 900MHz Specification: Item Type: MMDVM Hotspot Board PCB Material: ABS PCB Color: Green Applicable: P25 DMR YSF NXDN of for Raspberry Pi and OLED. Package List: 1 x MMDVM Hotspot Module2 x Antenna2 x Pin Header2 x SMA Antenna Interface Note: Please don't upgrade the firmware by yourself if you don't know it.