1. On-board resettable fuse and transient suppression diode, anti-overcurrent and overvoltage, anti-backflow, anti-static, improve shock resistance, stable and safe communication 2. On-board IO protection circuit, anti-surge, stable and safe communication 3. The onboard TTL serial port 3.3V and 5V level conversion circuit can switch the TTL communication level 4. There are 3 LED indicators on the board, which is convenient to check the status of power supply and signal sending and receiving 5. DC simple bull socket interface, smooth plug and unplug, sturdy and reliable, prevent reverse connection Specification: Product name: USB to TTL conversion module Product Type: Industrial Grade USB to TTL Converter Host interface: USB Communication rate: 50bps~6Mbps Device interface: UART USB interface: interface form: USB-A type interface; interface protection: self-recovery fuse, ESD electrostatic protection UART interface: interface form: terminal; interface form: 8PIN foolproof interface; interface protection: IO protection diode circuit Indicator light: PWR: Power indicator, connected to USB, and lights up when voltage is detected TXD: Send indicator, light up when data is sent from the USB port RXD: Receive indicator, light up when data is sent back from the device interface Compatible system: Support Win7/8/8.1/10/11, Mac, Linux, Android and other systems Product size: 53 x 23.5 x 14.6mm Colour: black Material: plastic Package Contents: 2 x USB to TTL conversion module 2 x 8pin DuPont cable 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.