Features: Main introduction: mmdvm2b duplex board with Building Baseband Unit, built-in battery, system ready, suitable for raspberry pie, MMDVM hotspot digital networking box, display firmware updated. Multiple system supported: Supports various digital communication system such as C4FM, DMRandDSTAR, and P25, providing more option and compatibility. Duplex function: It has duplex function and supports sending and receiving wireless signals, achieving full duplex communication. Color display screen: Equipped with a color display screen to visually display the current working status and related information, making it easy to operate and monitor. Quality housing: Designed with aluminum alloy casing, it has good heat dissipation performances and durability, ensuring long-term stable operation. Simple settings: The device configuration is simple and can be quickly set and adjusted through a color display screen and buttons, making it convenient for users to use. Specifications: Material: Aluminum Alloy Color: Silver Working frequency range: 144-148/219-225 Main bands: 420-475/842-950 Package Includes: 1x Duplex MMDVM Hotspot Board 2x Antenna 1x Receiver Adapter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.