Portable hand operated power generation, and used as a rechargeable emergency power source, can be manually powered to supply all kinds of electronic products. It not only acts as a generator, but also as a flashlight and lighter, perfect for difficult outdoor activities. The generator can be applied actively in field, field operation, field investigation, saving action, survival training, emergency communication, power shortage for a long time, tourism, emergency power and so on. DIY kit can practice hands-on skills, recommended 16+ years old and above. Warning: Do not use it for children. Turn off the power when not in use. Do not touch the top copper column with your fingers or other parts After pressing the I button, the voltmeter will automatically display. When the voltage is greater than 5V, USB can be used to charge other devices. Press the metal button on the left side, and the electric spark can be released between the top two copper columns. Different batches may have different appearance label printing, which will not affect the use Colour:White Material:plastic Package Contents: 1 x Hand Generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.