Elenco K-26 Metal Detector Soldering Kit [ SOLDERING REQUIRED ] Hone your DIY soldering techniques on this old school metal detector kit; Enjoy the pleasure of having assembled and soldered it yourself Find new money and old treasure When an AM radio is placed near the oscillator; it will emit an audible tone when metal is present Includes: PCB, electronic components, and instructions; PCB measures 28.6mmX44.5mmX1.6mm Add this kit to your STEM curriculum; From the company that brings you Snap Circuits - 9 volt battery not included