Part Number:1 welcome to my store , Hope you have a pleasant shopping trip! Features:1.Interesting - add 4-6V after the circuit is installed, it is a 7-channel binary counting light + 8 way water light, novelty fun.2.Practicality - The circuit has a specific function and is an electronic work.3.Simulation - with simulation questions, can be used for competition, selection, exams and other references.4.Savings - can be used repeatedly for desoldering to increase usage.5.Intelligent - the circuit can be energized to intelligently determine whether the welding is normal, and the fault point has a light indication.6.Innovative - the circuit design is novel and the difficulty is moderate.Specifications:Work voltage:DC 4V-6VPackage List:1 X Solder Practice BoardNotes:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. Training - A Total of 76 Components (excluding Pin Headers), 240 Solder Joints, Easy to Train Speed. Comprehensiveness - The Circuit Has 8 Types of Commonly Used Components and Is Familiar With the Use of more Components. Flexibility - Each Component Is Numbered, With No Parameters, and Can Be Flexibly Adjusted. Technical - The Circuit Has A Unique Working Principle, Provides A Complete Schematic, and Has 10 Test Points to Facilitate Various Tests, Which Is Conducive to Improving the Theoretical Level. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. See more product details Training - A Total of 76 Components (excluding Pin Headers), 240 Solder Joints, Easy to Train Speed. Comprehensiveness - The Circuit Has 8 Types of Commonly Used Components and Is Familiar With the Use of more Components. Flexibility - Each Component Is Numbered, With No Parameters, and Can Be Flexibly Adjusted. Technical - The Circuit Has A Unique Working Principle, Provides A Complete Schematic, and Has 10 Test Points to Facilitate Various Tests, Which Is Conducive to Improving the Theoretical Level. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.