All metal mode: lets you search for all different types of metal with auto ground balance and high sensitivity. It's the fine operation mode. DISC mode: discriminates what kinds of metal is being detected, you can use it for your needs. You can adjust the vo-lume level of speaker and headphone by your different needs. Earphone jack can lets you connect headphones to the detector, then can give you a better using experience. View meter and pointer: the meter pointer swings to the right if metal is found., Manufacturer: CFWWSAQ