American Hawks Basic Junior Metal Detector with Audio & Red LED Flash Light Alert | Adults Kids Adjustable (23"-35") | Underground Sensitivity Handheld Treasure Hunter | Gold Silver Iron coins Jewelry Pay attention to last photo in the above picture gallery. Search Coil need to be unfolded for testing or usage. Otherwise (in folded position), it will BEEP CONSTANTLY since Search Coil is testing the metal rod. 1. Adjust the dial switch away from the OFF position till the LED indicator lights and a beep sound is heard. 2. Rotate the dial switch backward slightly till the beep sound just disappears - this is the key point to adjust the metal detector into the most sensitive status. Buzzer sounds and LED lights when metal is detected. Sensitivity: &gt; 8 inch (for a US quarter). It means if the quarter is buried within 8 inches from ground, you can find it. 6.5 inch waterproof search coil (This is one of few models on the market under $50 that comes with a waterproof search coil.) Shaft extends from 23" to 34 1/2", Adjustable stem for comfortable use. Locates metals such as gold, silver, copper, aluminum, platinum and more. Only 1.5 lbs. Requires one 9V battery (included). Please note, this is the basic model of metal detector. There is no discrimination of any kind. Whenever it finds metal, it will beep. If you want a higher model without breaking your budget, you can search B002CHZ5SQ in top search box. It is a model with much better feature.