1. Functional Features 1. The RS232 interface of the notebook extension can be converted to a serial interface via USB, which may enable efficient and convenient connection to printers. 2. It supports the RS232 serial interface, remote power management, and a fully automatic serial communication handshake protocol. 3. A professional chip is used to achieve relatively stable signal transmission, with relatively stable performance and certain compatibility. 4. It uses PVC environmental - friendly materials, which have insulation and flame - retardant properties, and the nickel - plated connector is relatively durable and reliable. 5. The interface has a thickened nickel - plated layer, with corrosion - resistant, acid - and alkali - resistant, and high - and low - temperature - resistant performance, which may result in a relatively long service life. 2. Precautions Please confirm the interface and plug before purchase. This product has an RS232 9 - pin plug. Please confirm the RS232 9 - pin interface of the printer to avoid incorrect purchases. 3. Product Specifications 1. Product Name: USB to DB9 RS232 Connector Cable 2. Material: PVC 3. Cable Length: Approximately 120 cm (47.24 inches), 200 cm (78.74 inches), 300 cm (118.11 inches) 4. Instructions 1. Due to lighting effects and shooting angles, there may be certain tolerances in the product. Please understand. 2. Due to manual measurement, an error of 0 - 1 cm is allowed. 5. Package Contents 1 USB to DB9 RS232 Connector Cable