The M5Stack Chain Buzzer combines audible alerts with a programmable RGB LED, with UART daisy-chain connectivity for easily linking it with other M5Stack Chain series devices. The Chain Buzzer is a buzzer output node in the M5Stack Chain series. It features a built-in buzzer and programmable RGB LED, making it suitable for audible notifications, status alerts, smart home alarms, and other applications. It integrates an STM32G031G8U6 core MCU and uses a UART serial daisy-chain communication protocol. Two HY2.0-4P expansion ports allow additional Chain series devices to be connected, enabling richer audio-visual interactive applications. Features M5Stack Chain series Buzzer audio output STM32G031G8U6 core MCU 1 x RGB LED UART serial daisy-chain communication protocol 2 x HY2.0-4P expansion ports for connecting Chain series devices Specifications MCU STM32G031G8U6 Input Power DC 5V Communication UART 115200bps@8N1 Interface 2 x HY2.0-4P Buzzer MLT-5020 RGB LED 1 x WS2812C Working Power 5V@198.3mA (buzzer duty cycle 50%, frequency 9.9kHz) Working Temp 0 ~ 40°C Product Size 23.9 x 23.9 x 16.0mm Product Weight 5.9g Resources Documents Package Contents 1x M5Stack Chain Buzzer