ICStation DIY electronic hourglass soldering kit is a learning kit that need the user to finish the assemble process. This soldering kit is not includs any battery, but includes the basic SMD components and good quality PCB boards. The components' names are marked on board, the circuit design is simple, and we provide the English instruction [pdf], to make it easy to assemble. It is a nice soldering practice project for electronic enthusiast and DIY beginners, perfect for school basic electronic educational experiment, STEM training and so forth. Sand timer LED flashing light assemble kit is consists of 57pcs 5mm LED diode. When provide the 5V power supply, the LED diodes will light up to simulate the sandglass movement (the top LED diode lights will drop down and the bottom LED diode lights will heap up), when reach the time, press the button again, it will repeat this process in the opposite direction with lots of fun. -----------------------------❤❤ Warm Prompt ❤❤-----------------------------1. You are free to download the instruction in the Product Information section on this page, your will see a blue words "User Manual [pdf]" under the Technical Specification, click "User Manual" to view and download the English Instruction.2. You may need these tools to practice: soldering iron, iron stand, tweezers, multimeter, pliers, screwdriver set, solder sucker, solder wire, clean sponge.3. Please check part values and quantities against part list, always meter resistor values before soldering, understand all part polarities and orientations.4. Please make sure all components in right dirction and right place; and check whether any soldering points with poor contact, this is very important in practicing and testing.5. If you have any question, please ask on this page or feel free to contact us by clicking "icstation" at the cart, then click "ask a question".