Five FT232RL based USB to TTL serial converter modules from Geekcreit. These modules provide a reliable USB to serial bridge for Arduino projects and other microcontroller work. Built around the FTDI FT232RL chipset, they offer a straightforward way to connect a computer to a microcontroller via a TTL serial interface. Key benefits Easy USB to serial bridge for programming and serial communication with microcontrollers. Wide compatibility with official Arduino boards and development environments through FTDI drivers. DTR line support for auto reset during Arduino bootloader programming, simplifying sketch uploads. VCCIO selectable 3.3V or 5V to match device logic levels and protect connected hardware. Compact, PCB based modules that are breadboard friendly for quick prototyping. Pack of five pieces provides spare adapters for multiple projects or team use. Key attributes Chipset: FT232RL Interface: USB 2.0 fullspeed to TTL serial Voltage levels: VCCIO selectable for 3.3V or 5V logic Serial signals: TXD, RXD, GND, VCCIO; DTR and RTS lines available on many boards for reset and control Driver support: Compatible with Windows, macOS, and Linux via FTDI drivers Form factor: Compact, easy to integrate into projects or development setups Package: 5 pieces per pack from Geekcreit Applications and use cases Programming Arduino boards (Uno, Nano, Mega, and compatible boards) via USB connection using the Arduino IDE. The DTR line enables automatic reset for bootloader operation. Serial data communication and debugging with microcontrollers such as ESP8266, ESP32, STM32, or other 3.3V/5V devices, allowing easy monitoring and control from a computer. Spare or replacement USB to serial adapters for embedded projects, electronics classrooms, or multidevice development environments. Notes Ensure proper voltage level matching when connecting to target devices. Use the VCCIO setting to align with the device logic level to avoid damage. This pack contains five identical FT232RL USB to TTL serial converter modules for convenient multidevice use.