1Compact size and light weight, and it's black, so it's hard to see. 2Directly dial the card number in the locator, and after a few seconds, you can hear the sound around the locator. 3The machine will not emit any sound or light, so it is safe to use. 4Base station positioning adds map positioning to reduce product error. 5Built-in 2 magnets, with strong magnetic function, can be arbitrarily adsorbed on the iron.
