1. Functional Features The RS232 interface of the notebook extension can be converted to a serial interface via USB, enabling efficient and convenient connection to printers. Supports the RS232 serial interface, remote power management, and a fully automatic serial communication handshake protocol. A professional chip ensures stable signal transmission, reliable performance, and broad compatibility. Constructed with PVC environmental-friendly materials that provide insulation and flame-retardant properties. Nickel-plated connectors enhance durability and reliability. The interface features a thickened nickel-plated layer, offering corrosion resistance, acid and alkali resistance, and high and low temperature tolerance, contributing to an extended service life. 2. Precautions Please confirm the interface and plug type before purchase. This product includes an RS232 9-pin plug. Ensure your printer has an RS232 9-pin interface to avoid compatibility issues. 3. Product Specifications Product Name: USB to DB9 RS232 Connector Cable Material: PVC Cable Length: Approximately 120 cm (47.24 inches), 200 cm (78.74 inches), 300 cm (118.11 inches) 4. Notes Due to lighting effects and shooting angles, there may be slight variations in product appearance. Due to manual measurement, a tolerance of 0–1 cm is acceptable. 5. Package Contents 1 x USB to DB9 RS232 Connector Cable