The output of the charging treasure is 5V, so the working voltage of the lamp you want to connect is also 5V, use the charging cable of the charging treasure as the red line is positive, the black line is negative, and you can also use a multimeter to detect the positive; In fact, these are not sure it doesn't matter, after the line is connected to the light, the light is good (the light is not lit, and the light is not hurt).
otg connected to usb hub, two handles, mobile phone simulator play red and white machine games. otg to usb lights\/fans, or connect to a usb cable to charge another phone. Even a usb cable can charge a mobile power supply. windows tablet otg connects to usb hub and turns mouse and keyboard into notebook.