CH344 is a USB bus adapter chip that enables the conversion of USB to four asynchronous serial ports UARTO/1/2/3. It is used to expand asynchronous serial ports for computers or upgrade ordinary serial devices or MCUs directly to the USB bus. Product function: USB to 4-way RS485 conversion Product features: 4 COM ports, capable of simultaneously sending data mission speed: 480Mbps Supporting baud rates: 1200bps-6Mbps<br><br>Power consumption: 5V 4mA (static) Temperature: -40-+85 ℃ Color:Black Material:plastic<br><br>Package Contents: 1 x USB to 4 RS485 Module<br><br>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.