NOTE:This product is used for USB interface pressure test, can not be used against the law and ethical behavior!! Only for testing and research, any disputes and adverse consequences shop is not responsible for, please consider carefully before buying!!! This product is plugged into the required USB interface. It will automatically discharge. You only need to record the data you need to measure with other measuring instruments while it is discharging. However,it is recommended that the connection work time is less than 10 seconds. In the limit case, it does not exceed 30 seconds. Because the product has many components placed on a very small area, the effect is obvious. Under the premise of not being able to wait for good heat dissipation (forced cooling), please do not exceed the above working time. This product is only suitable for computer motherboards, industrial control equipment, testing of measuring instruments and other discrete power supply mainframes or their options. Its interface is USB TYPE-A. Not applicable: microusb .Usb typec. Lighting .A pin-intensive interface. Operational precautions: Avoid using and storing this product in areas that are above the temperature limit, excessive humidity and excessive dust. Do not excessively impact, crush or bend the product. Do not attempt to disassemble this product. Safety Precautions: Keep products out of the reach of infants and young children. This product does not contain a battery, but it generates high voltage during operation (the booster circuit output is fixed at 300V, when the output is connected to the load, the voltage is pulled down to the discharge threshold voltage, the center value is 230V, and the error is +/- 30%). Therefore, do not remove or damage the heat-shrinkable tube skin attached to this product (the heat-shrinkable tube has a withstand voltage of 600V)