1. Functional Features<br> 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.<br> 2. It supports the RS232 serial interface, remote power management, and a fully automatic serial communication handshake protocol.<br> 3. A professional chip is used to achieve relatively stable signal transmission, with relatively stable performance and certain compatibility.<br> 4. It uses PVC environmental - friendly materials, which have insulation and flame - retardant properties, and the nickel - plated connector is relatively durable and reliable.<br> 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.<br><br>2. Precautions<br> 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.<br><br>3. Product Specifications<br> 1. Product Name: USB to DB9 RS232 Connector Cable<br> 2. Material: PVC<br> 3. Cable Length: Approximately 120 cm (47.24 inches), 200 cm (78.74 inches), 300 cm (118.11 inches)<br><br>4. Instructions<br> 1. Due to lighting effects and shooting angles, there may be certain tolerances in the product. Please understand.<br> 2. Due to manual measurement, an error of 0 - 1 cm is allowed.<br><br>5. Package Contents<br> 1 USB to DB9 RS232 Connector Cable