Coin / Stainless / Metal Detector Scanner Unassembled Kit Project 9VDC [FK919] &lt;==Beware to Add To Cart !!! Only sold by Thaikits for product warrantee and free technical support. Require Power Supply 9VDC ( 9V battery ), Current Consumption 40mA operate mode Adjustable the sensitivity to detect by POT / Detection distance 1-5cm depend on size of metal Buzzer alarm and red LED turn on when sensor can detect the metal PCB size : 3.01" x 1.71" / Free 9V battery connector only sold by Thaikits