Features: STM32G031G8U6 core controller Uses UART serial cascading communication protocol, supports single/multi-device chain connection for Chain series 1 RGB LED, can be used as a status indicator 1 HY2.0-4P multi-function expansion interface, expandable for Unit series devices 2 HY2.0-4P UART interfaces, expandable for Chain series devices Parameters: MCU: STM32G031G8U6 Interfaces: 2 x HY2.0-4P UART interfaces, 1 x HY2.0-4P multi-function expansion interface RGB LED: 1 x WS2812 Communication Interface: UART 115200bps @ 8N1 Cascading Protocol: Chain Bus UART serial cascading communication protocol Cascading Functions: Device UID query, version query, link device enumeration, heartbeat communication, etc. Topology Interface Functions: I2C communication control, GPIO management (including interrupt configuration and status query), ADC acquisition, NVIC interrupt management Power Consumption: RGB self-illumination maximum brightness [email protected] Color: White Material: plastic Package Contents: 1 * ChainBus 2 * HY2.0-4P Grove Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.