1、INDICATOR AND VOLTAGE: USB to TTL serial module with red power indicator PWR, green TXD and RXD indicator; 3.3V and 5V dual voltage options 2、APPLICABLE SYSTEM: USB to TTL serial adapter support for XP, for win7, for win8, for win10 system, useful and practical, very versatile to use 3、MULTIPLE PROTECTING: USB to TTL serial converter adapter module with short circuit protecting, overcurrent protecting, high voltage protecting functions 4、EASY TO OBSERVE: USB to TTL UART adapter reserve RTS, CTS positions, in the absence of instruments to intuitively understand whether the product is working 5、TECHNICAL PARAMETERS: USB to TTL adapter adopt USB2.0 interface, and supports the baud rate range of 50 bps-2 MBPS, PCB material has stable performance