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 is used to achieve stable signal transmission, with reliable performance and compatibility. Constructed with PVC environmental-friendly materials that provide insulation and flame-retardant properties; nickel-plated connector ensures durability and reliability. The interface features a thickened nickel-plated layer, offering corrosion-resistant, acid- and alkali-resistant, and high- and low-temperature-resistant performance for extended service life. 2. Precautions Please confirm the interface and plug before purchase. This product has an RS232 9-pin plug. Verify the RS232 9-pin interface on your printer to ensure compatibility. 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. Instructions Due to lighting effects and shooting angles, there may be slight variations in color or appearance. Due to manual measurement, a tolerance of 0–1 cm may apply. 5. Package Contents 1 x USB to DB9 RS232 Connector Cable