This modure is a 4-Chanel 5V-3V Logic Convertor.It is the birdge of communication between the device working voltage of 5V and 3V.For example,in serial communication,a MUC working voltage is 5v, your device working voltage is 3v,when your device need to communication with that MCU，you can use the 5V-3V Logic Convertor to do that.
Four MOSFET to realize four road 3 v and 5 v Logic Converte
Power input protection meter, integration 3.3V LDO, and can provide no more than current of 150 mA
With power LED, indicate work or not
It can realize UART, IIC,one- wire, SPI bus signals such as 3 v to 5 v level of two-way transformation