Features: 1.The 1.5V and 3.3V microcontroller serial ports are directly controlled. Whatever the serial port outputs, the product will report . For example, printf("Hello everyone"); the product speaker will broadcast "Hello everyone", supporting numbers, letters, and Chinese broadcasts. Convenient, practical and economical. 2. The communication baud rate is fixed at 9600,8,n,1 3. Line sequence red, green, yellow and black corresponds to 5v rx tx gnd 4. Can be directly connected to the USB to TTL module for testing 5. The serial port is TTL level and can be directly connected to the 3.3v and 5v microcontroller serial port pins. The power supply is 5V. 1. Terminal: 4p 1.5mm pitch 2.Module size: about 40 x 30 x 15mm 3. Cord length: about 9cm 4. Red, yellow, white and black: corresponding to 5v rx tx gnd 5. Specifications: With shell 6. Product type: serial port module 7. Communication interface: interface 8.Power supply voltage: 5V Material: PCB + plastic + ABS colour: As shown Package Contents: 1 set x TTS Chinese text-to-speech synthesis module with shell 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.