The USB CP2102 Serial Converter is a small adapter required for the RF Explorer 3G+ IoT for Arduino/Seeeduino board to accept firmware upgrades from a computer. See more details. It can be used as well as extra Arduino Serial port if a Seeeduino or other small-form factor board is used with the RF Explorer 3G+ IoT board. This USB converter can be also used for any electronic project if a microcontroller need to convert a serial UART signal into a USB compatible COM Virtual port. NOTES：The USB fixed foot of this product is not soldered. Compatible with RF Explorer 3G+ IoT for Arduino firmware upgrade process Enables USB / UART serial port in any electronic project Silicon Labs CP2102 USB adapter USB specification 2.0 compliant with full-speed 12Mbps Standard USB type A male and TTL 6 pin connector. 6 pins for 3.3V, RST, TXD, RXD, GND, 5V Baud rates: 300 bps to 1.5 Mbps Temperature Range: -40 to +85 ℃ Compatible Windows/Linux/MacOS/Android 1 x USB CP2102 Serial Converter 1 x Female/Female cable ribbon cable For technical support or questions, please visit our website.