HiLetgo CP2102 USB 2.0 to TTL Module Serial Converter Adapter Module USB to TTL Downloader With Jumper Wires Stable and reliable chipset CP2102 Baud rates: 300 bps to 1.5 Mbps Connect MCU easily to your computer! Standard USB type A male and TTL 5pin connector. 5pins for 3.3V, RST, TXD, RXD, GND & 5V Supports Windows 98SE, 2000, XP, Vista, Window7, Mac OS 9, Mac OS X & Linux 2.40