NOTE: This product is intended for USB interface pressure testing purposes only and must not be used for any illegal or unethical activities. It is designed solely for testing and research applications. The seller assumes no responsibility for any disputes or adverse consequences arising from its use. Please consider this carefully before purchasing. The product connects to a USB interface and will automatically discharge when plugged in. Users should record the required measurement data using external measuring instruments during discharge. It is recommended that the connection duration does not exceed 10 seconds. In extreme conditions, do not exceed the specified time limit. Due to the high component density in a compact area, heat generation is significant. Without adequate heat dissipation or forced cooling, prolonged operation is not advised. This device is compatible only with computer motherboards, industrial control equipment, and testing instruments with discrete power supplies equipped with a USB TYPE-A interface. It is not suitable for Micro USB, USB Type-C, Lightning, or pin-dense interfaces. Operating Precautions: Avoid using or storing the product in environments exceeding temperature limits, high humidity, or excessive dust. Do not subject the device to strong impacts or bending. Disassembly of the product is strictly prohibited. Safety Precautions: Keep this product out of reach of infants and young children. Although it contains no battery, it generates high voltage during operation (the booster circuit outputs a fixed 300V; when connected to a load, the voltage drops to an average of 230V with a tolerance of ±30V). Do not remove or damage the heat-shrink tubing provided on the product (rated for 600V insulation). If the heat-shrink tubing is damaged, discontinue use immediately. In case of abnormal conditions such as incorrect output voltage (too high or too low), unusual noises, overheating, or fire, disconnect the device immediately. This product is a test instrument designed for sustained voltage output based on a Boost converter structure. It draws input power directly from the USB interface (5V 1A or higher) and does not require charging. However, it requires a stable USB power source: output voltage of 5V (±20% tolerance) and current output of at least 1A. Failure to meet these requirements may result in malfunction. Color: Yellow + Silver Material: Plastic + Metal Package Contents: 1 x USB Tester Only the items listed above are included; other accessories are not part of the package. Note: Lighting and display differences may cause slight variations in the color representation. Measurement error allowance is ±1–3 cm.