Fangrui Product Details Features: 1. Usb To Ttl To Rs485 Communication Module, 5v-3.3v/1.8v Dual Voltage Conversion Module 2. The Usb To Ttl To Rs485 Communication Module Uses The Ch340e Chip To Support Half-duplex Signal Transmission Between Usb And Ttl, Usb And Rs485. 3. Transmission Distance Up To 1200 Meters (tested At 9600bps), With Signal Transceiver Indicator Light 4. Support Dual Voltage Conversion Function Of 5v To 3.3v And 5v To 1.8v. 5. It Has The Advantages Of Long-distance Transmission, Low Signal Transmission Delay And Low Power Consumption, Stable And Secure Communication. Description: 1. Product Name:voltage Conversion Module Material: Pcb Colour: As Shown Package Contents: 5 X Voltage Conversion Module 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.