... can distinguish metal type by tones4. 9.5-inch disk waterproof probe that can detect in the shallow water.5. equipped ... ), easy to use; built-in high-capacity rechargeable battery, a low-voltage t function, with charger, Worked continuously for more than ten ... ~3.5m2, Signal Frequency:9.6KHz3, Audio Frequency : 400Hz4, Power Supply:DC12V( Built-in rechargeable battery)5, Power Consumption:0.8W6 ...