Review on 🔍 Ultimate 3/4 inch Wall Stud Finder and Metal Detector Sensor - Precision Wood and Metal Scanner for Effective Wall Detection by Curtis Domus

I made the mistake of unscrewing the screw on the back, thinking (very wrong) that I needed to put the battery in. The button on the side popped out inside the device. I had enough time to retrieve it and shoot it again. Just slide (or pull out) the black part and put the dough inside. After that it worked great!