3Pcs Metal Detector Kit Electronic Soldering Practice Kit DC 3V-5V 60mm Non-Contact Sensor Board Module DIY Electronic Part Metal Detector

Metal detector is a high performance metal detector designed for security, working Voltage: DC3-5V, Detecting Distance: <60mm.
Simple circuits are easy to assemble and train your welding skills during assembly. For welding beginners is really an interesting welding practice(Board Size:about 8.6*6cm).
It can apply to game entertainment, security check, search for metal product, car detection, traffic statistics, elevator floor control, production equipment position detection, production equipment development and design, electronic product design, play equipment development, metal proximity switch, metal detection in human body.
Buzzer start to ring and the red light indicator is on when the metal is close to the metal detector.
The metal detector is powered by 3V to 5V DC power, turn on the power and turn on the power switch, at this time, the buzzer will sound, the LED is bright, slowly adjust the VR1 potentiometer, so that the buzzer just does not ring.