Pinout - Red = Vcc 5V, Green = RX, Yellow = TX, Black = GND. Key benefits - Direct serial control for 1.5V and 3.3V microcontrollers. The module vocalizes the serial port data, turning text into spoken output. - Supports numbers, letters, and Chinese speech. Useful for clear audible feedback in microcontroller projects. - Built-in speaker provides immediate voice output, making alerts and messages audible without external components. Features and compatibility - Compatible with 5V serial interfaces; direct connection to microcontroller UART via the pinout above. - The serial data stream is spoken by the module, matching the transmitted characters. - USB-to-TTL module can be connected for easy testing and development. - Baud rate fixed at 9600, 8 data bits, no parity, 1 stop bit (9600,8,N,1). Performance and use cases - Simple integration for Arduino, ESP32, and other microcontroller projects requiring spoken feedback. - Educational kits to demonstrate serial communication and speech synthesis. - Home automation or embedded systems to announce status updates, warnings, or alerts. Usage scenarios - Arduino project sends alert messages over UART; the module speaks the message through its speaker. - Testing and development using a USB-to-TTL adapter to send test phrases or prompts. - Quick prototyping of voice prompts for status indicators in small embedded devices.