HOW TO USE: This is a USB adapter cable 1 male to 4 female socket, used to light up the building block building kit. With this socket, you can connect more light accessories and make the building blocks look brighter and more beautiful. | IMPORTANT NOTE:This listing only include the adapter cable ,not include the led light and not incldue the power provider. | MULTIPLE OPTIONS: can be powered by power bank/battery box/wall charger /other device with usb port (the output voltage should be less than 6V), easy to operate. | SERVICE:If you have any questions please feel free to contact us or ask questions by QA, we will answer your questions as soon as possible.