This one is unofficially known as the Garrett Carrot! It's submersible to 20 feet and has increased sensitivity. More on it:
3 Sensitivity Levels - for improved detection of gold nuggets and other tiny targets
Automatic Power Off - after 5 minutes with no button presses, the pinpointer emits periodic warning chirps
Lost Pro-Pointer Alarm - after 60 minutes of warning chirps; saves battery.