Comes with English user manual and online PDF file which will guide you how to finish step by step perfect for school basic electronics experiment projects. The suite adopts double layer PCB and the circuit consists of 30 pieces white LED blue ray. Manufacturered by Gikfun. Under the control of MCU program it displays analog hourglass image. Power Supply Voltage3.3-5V This is a beautiful electronic hourglass that is fun to build and nice to look at when finished it is not only a PCB board for practicing welding skills but also a decorative gift for you.