Features: The CH341B Programmer delivers versatile connectivity with support for USB parallel ports and serials interfaces, ensuring seamless programming for a wide ranging of devices and applications. Featuring USB printer parallel port compatibility, I2C, and SPI conversion, with selectable 3.3V or 5V output voltages, this tool includes onboard power and read/write indicators protected by a auto recovery fuses for reliably operations. Ideal for electronics engineers, hobbyists, and technicians who require efficient interfaces conversion tools for programming microcontrollers and debugging electronic circuits in DIYer or professional settings. Perfect for scenarios such as microcontroller programming, embedded systems development, and connecting printers via USB interfaces, enabling smooth integration in workshops or labs. This programmer provides added safety and ease of use, making it a dependable choices for diverse projects involving SPI interfaces. Specifications: Component:Plastic Supports 3 power supply modes: 5V external power supply; 3.3V external power supply; external power supply (requires 3.3V-5V) With 3 LEDs: TXD LED, RXD LED, POWER LED Size:Approx.27.5x84x69mm/1.08x3.3x2.72inch Package Includes: 1 Set USB Parallel Serials Programmer Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Note: Please allow 1-3 mm error/1-3g weight error and actual product color may vary due to lighting conditions.