While I do own a GP Pointer and, in general, find it quite adequate for most of my detecting, it is by no means a top-shelf pinpointer. Mine will occasionally start beeping for the sheer joy of making noise. I've found if I remove and replace the battery (same battery, not new) before using the first time, the spontaneous beeping isn't as problematic.
I took a piece of clear packing tape and covered the sound holes which makes the unit a bit more water resistant ... still not waterproof.
Again, I know there are "better" pinpointers out there and I will likely buy one someday but for now, the GP Pointer does exactly what I need for it to do.