Features 1、【DIY Welding Exercise】: Metal detector DIY kit, you need to weld and assemble it by yourself, providing an engaging way to learn about electronics and circuit board assembly. It can not only exercise hands-on ability, but also improve electronic production skills, suitable for electronic enthusiasts and students. 2、【Dual Alarm System】: When the detector is close to the metal, the buzzer and LED light will alarm at the same time, providing both visual and auditory prompts for more accurate and convenient detection. 3、【Adjustable Alarm Threshold】: By rotating the potentiometer, the alarm threshold can be adjusted according to your needs to make the device more sensitive and meet different detection needs. 4、【Portable Design】: The metal detector is compact, lightweight, and easy to carry, suitable for use in various environments, such as games and entertainment, safety checks, and so on. 5、【Learn Knowledge /u0026amp; Cultivate Thinking】: By assembling and using the metal detector by yourself, you can cultivate interest in electronic and physical knowledge and stimulate innovative thinking. Perfect for beginners looking to explore the fundamentals of electronic and circuit design. Specification This DIY metal detector kit provides an engaging way to learn about electronics and circuit board assembly. It is not only a fun and interactive educational tool, but also a practical device for various metal detecting needs, providing a hands-on learning experience for electronics enthusiasts, hobbyists, and educators who want to delve into the world of circuitry and metal detection. Features: 【DIY Welding Exercise】: Metal detector DIY kit, you need to weld and assemble it by yourself, providing an engaging way to learn about electronics and circuit board assembly. It can not only exercise hands-on ability, but also improve electronic production skills, suitable for electronic enthusiasts and students. 【Dual Alarm System】: When the detector is close to the metal, the buzzer and LED light will alarm at the same time, providing both visual and auditory prompts for more accurate and convenient detection. 【Adjustable Alarm Threshold】: By rotating the potentiometer, the alarm threshold can be adjusted according to your needs to make the device more sensitive and meet different detection needs. 【Portable Design】: The metal detector is compact, lightweight, and easy to carry, suitable for use in various environments, such as games and entertainment, safety checks, and so on. 【Learn Knowledge & Cultivate Thinking】: By assembling and using the metal detector by yourself, you can cultivate interest in electronic and physical knowledge and stimulate innovative thinking. Perfect for beginners looking to explore the fundamentals of electronic and circuit design. Specifications: Name: Metal Detector DIY Kit Material: printed circuit board Battery: 2 * CR2032 button batteries (not included) Working current: 23mA (under normal alarm condition) Static working current: 3.7mA (without alarm) Working voltage: 3-5V Maximum detection ranges: 30-50mm LED flashing alarm: support Adjust the alarm threshold: Support Buzzer sound alarm: Support Power switch: Support Power indicator: Support Item size: 60 * 185mm / 2.36 * 7.28in Item weight: 52g / 1.83ounce Package size: 150 * 60 * 30mm / 5.91 * 2.36 * 1.18in Package weight: 53g / 1.87ounce Packing List: 2 * 100Ω Resistor 2 * 2K Resistor 3 * 10K Resistor 1 * 200K Resistor 3 * Capacitor 4 * S8050 Audion 2 * S9012 Audion 1 * 100Ω Potentiometer 2 * Ceramic Capacitor 1 * Self-locking Switch 2 * Electrolytic Capacitor 5 * Diode 1 * Buzzer 2 * Battery Holder 1 * Printed Circuit Board 1 * Guideline Package List Packing List: 2 * 100Ω Resistor 2 * 2K Resistor 3 * 10K Resistor 1 * 200K Resistor 3 * Capacitor 4 * S8050 Audion 2 * S9012 Audion 1 * 100Ω Potentiometer 2 * Ceramic Capacitor 1 * Self-locking Switch 2 * Electrolytic Capacitor 5 * Diode 1 * Buzzer 2 * Battery Holder 1 * Printed Circuit Board 1 * Guideline