The Bounty Hunter Mach-1 is a VLF single frequency metal detector that operates at 7.69 kHz. This is a standard, entry-level frequency calibrated for coin-shooting.
This is a good frequency for finding dime-sized coins at 2” and quarter-sized coins at 6”. Larger targets can be detected at approximately 18” deep.
Depth detection will depend on the target type, orientation in the ground, minerals in the soil, and detector settings.