Fangrui Product Details This Module Is An Isolated Usb-ttl. The Interface Used Is The Mainstream Type-c Interface. Insert The Type-c Data Cable To Connect To The Computer. The Signal Sampling Is A Dedicated Signal Isolation Chip, Which Makes The Output More Stable. The Power Indicator Light And The Humidity Module Are More Clear. Usb Power Supply: Usb 5v, Type-c Interface Ttl Terminal Power Supply: 3.3v, With Power Indicator Ttl End Signal Level: 3.3v (ttl End Only Supports 3.3v Power Supply And 3.3v Ttl Signal, Not 5v!) Communication Protocol: Pure Hardware Equipment, Not Restricted By Protocol Baud Rate: Up To 25600bps Isolation Level: Power Isolation And Signal Isolation, Isolation Voltage Ac300ovrms, Static 8kv Temperature Range: -4080support System: Support Hot Swap, Support Win98/ce/2000/2003/2008/xp/win7/win8/win10/vista/- Linux/ Osx System, Usb Interface Is Hot-swappable Product Size: 23mm X 23mm X 7mm Interface Description: 3.3v: 3.3v Output Positive Rx: Uart Serial Port Input Tx: Uart Serial Port Output Gnd: N