Features 1、【32-bit ARM Processor】: The circuit board integrates a powerful 32-bit ARM processor that can provide strong processing power to ensure the smooth and efficient operation of digital radio protocols. This enhances the overall performance and reliability of your digital radio communications, thereby improving the user experience. 2、【Pre-assembled and Tested】: The expansion board comes fully assembled and rigorously tested, ready for immediate integration with your Raspberry Pi, which ensures out-of-the-box functionality and minimizes the setup time. Support the testing of PI-STAR. 3、【Supports Multiple Digital Radio Standards】: Supports 10 MW radio frequency power. Compatible with DMR, P25, D-STAR, and SystemFusion standards. Whether you're involved in amateur radio, public safety, or commercial applications, this board meets the different needs of users and has high flexibility in use. 4、【User-Friendly Interface and Connectivity】: With an onboard OLED display and SMA antenna connector, the board provides a convenient way to view radio status and connectivity options. The display shows Tx, Rx, PTT, and mode information, while the SMA connector supports a variety of antenna types, including ultrahigh frequency antennas for the 430-450MHz, 43MHz, and 900MHz bands, and veryhigh frequency antennas for the 144-220MHz frequency band. 5、【Pre-loaded Firmware & Open-source File】: The firmware is pre-loaded and easily upgradeable through software updates, ensuring access to the latest features and improvements, greatly enhancing the user experience. By providing open-source 3D printable files, users can customize the product according to their needs, adding to the fun and personalization of the product. Specification Name: MMDVM Board Material: printed circuit board Type: without housing, with housing (optional) Item size: 65 * 30 * 23mm / 2.56 * 1.18 * 0.91in Package size: 130 * 90 * 25mm / 5.12 * 3.54 * 0.98in Package weight: Without housing: 22g / 0.78ounce With housing: 60g / 2.12ounce Package List Packing List (without housing): 1 * MMDVM Board 1 * Antenna 2 * Pins OR Packing List (with housing): 1 * MMDVM Board 1 * Antenna 2 * Pins 1 * Housing