TECNOIOT CP2104 USB to RS232 TTL UART 6PIN Connector Module Serial Converter Serial Converter CP2104 USB to RS232-TTL-UART 6PIN Connector Module: Amazon.de: Computer & Accessories
5Pcs RobotDyn® CP2104 USB-TTL UART Serial Adapter Microcontroller 5V/3.3V Module Digital I/O USB-A