Indicator light: PWR: Power indicator light, connected to USB, lights up when voltage is detected TXD: Transmit indicator light, lights up when data is sent from the USB port RXD: Receive indicator light, lights up when data is sent back from the device interface<br><br>Product type: Industrial grade USB to TTL serial port cable Chip solution: FT232RNL Host interface: USB Communication rate: 300bps~3Mbps Device interface: UART USB interface: Interface form: USB-A type interface Interface protection: resettable fuse, ESD electrostatic protection UART interface: Interface form: 4PIN cable loose ends SH103PIN fool-proof serial port interface Interface protection: IO protection diode circuit Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Material: plastic colour: Black<br><br>Package Contents: 1 x Serial Module Cable<br><br>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.