Adopts new version CH343G chip. Compared with CH340G, it supports higher data rate (up to 6Mbps) and more serial port IO levels (5V / 3.3V / 2.5V / 1.8V) Supports Mac, Linux, Android, Windows 7/8/8.1/10/11. Adopts double-sided black immersion gold process, which is durable and has a good look Onboard resettable Fuse and Transient Voltage Suppressor, anti-overcurrent and anti-overvoltage, anti-surge, anti-static, improve shock resistance, stable and safe communication performance Onboard IO protection circuits, anti-surge, anti-static, stable and safe communication performance. Onboard 3.3V and 5V TTL level switch pins for selecting TTL communication level Support 3.3V/5V output (the module is powered by USB, and the onboard jumper should be shorted to 3.3V or 5V accordingly)