Key benefits Stable and reliable chipset that supports the full range of STC singlechip microcomputers with output voltages of 3.3V and 5V, ensuring compatibility with common MCU boards. Wide operating system compatibility: Windows 98SE, 2000, XP, Vista, Window7, Mac OS 9, Mac OS X, and Linux 2.40, enabling use across different environments. Flexible baud rate support: 300 bps to 1.5 Mbps, with a maximum support of 115200 bps for speed serial communication and faster data transfer. Easy connection to MCUs: standard USB type A male connector paired with a TTL 5pin connector. 5pins for 3.3V, RST, TXD, RXD, GND & 5V; simplifies connecting MCUs to your computer. Visual feedback and status indicators: power, data reception, and data transmission LEDs. After correct driver installation, the status indicator remains on; transmit and receive LEDs flash during communication, and brightness decreases at higher baud rates for a clear ataglance status. What it does USB to TTL serial interface designed for STC microcontrollers, enabling straightforward programming, debugging, and data exchange between a computer and MCU hardware. Key specifications and features Chipset: Stable and reliable, supports full range of STC singlechip microcomputers with 3.3V and 5V output. OS compatibility: Windows 98SE, 2000, XP, Vista, Window7, Mac OS 9, Mac OS X, Linux 2.40. Baud rates: 300 bps to 1.5 Mbps; baud rate supported up to 115200 bps. Connectors: Standard USB type A male; TTL 5pin connector with 5pins for 3.3V, RST, TXD, RXD, GND & 5V. Indicators: Power, data reception, and data transmission LEDs; status indicator on after driver installation; transmit and receive LEDs flash during communication; higher baud rate leads to lower brightness. Use scenarios Firmware programming and debugging for STC microcontroller projects on Windows, Mac, or Linux systems. Serial communication bridge for development boards and TTLbased sensors or modules requiring 3.3V/5V logic levels. Prototyping and testing serial interfaces in embedded projects that require a reliable USBtoTTL connection. Notes The device uses a USB to TTL interface designed for ease of use with STC microcontrollers and supports a broad range of operating systems and baud rates as specified.