Device interface: full-speed USB device interface, compatible with USB2.0 Baud rate range: 50bps -3Mbps Operating temperature: -40 - 85 Chip: CH340G chip Protection function: anti-short circuit, anti-overcurrent, anti-high voltage multiple protection functions<br><br>Indicator light: PWR light, TXD light, RXD light, light, light Pin: reserved hardware flow control pins DTR, DCD, RI, and USB status pin ACT, convenient for external control of other devices Supported signal voltage: 3.3V/5V (can be through the onboard dip switch, the voltage value needs to be switched through the dip switch when the module is powered off.) Supported system: Linux, 11/10/8.1/8/7/VISTA/XP, OS (The product printed words depending on the batch, but this does not affect use) Specification:B Color: As Shown Material: PCB<br><br>Package Contents: 1 * USB to TTL Converter 1 * 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.