Features: High-performances 32-Bit Arm processor, supports multiple modes and system integration. The firmware is preloaded and can be easily upgraded through software. This expansion board has multiple functions and can support hotspots, duplex communication, etc., providing wide rangeS of application areas. The product design is simple and convenient, easy to install and use, ensuring that users can quickly get started and enjoy the convenience it brings. This expansion board is compatibility with MMDVM system and can achieve efficient and reliable digital voice communications. The product does not come with a USB port, making it more compact and portable, making it easy to carry and use. Specifications: Material: PCB+Metal Size: Mixed Size Function: SLOT1, SLOT2 support UHF:433 900 Mhz, VHF:144 220 Mhz Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1x Duplex MMDVM Hotspots Board Without USB Version 2x Antenna 2x Pin Header