This product is only suitable for computer motherboards, industrial control equipment, testing of measuring inst ents and other discrete power supply mainframes or their options. Its interface is USB TYPE-A. Not applicable: micro-usb.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. No need to charge. Do not work more than 10 seconds (to prevent burning), do not plug in the charging head (mains danger), do not plug in charging treasure (lithium ion activity is strong). 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!!! IT IS USB High Voltage Pulse Generator . It is not a USB flash drive. Please use legitimate charging head to test the killer. The 3rd generation output is minus 300V- negative 500V. 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 inst ents 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. Colour:Black-Gray Material:Metal Package Contents: 1 x USB killer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store