The devices has three detection modes: audio, vibration, audio and vibration, you can change the modes for your different needs. IP68 waterproof grade, you can use this product underwater, not just limited to the ground, to expand your detection space. Lost alarm function: With this function, it is easier to find the device in order o avert you lose it, if the button is not pressed or the device does not detect any target within 1 minute, the missing alarm be activated. The device starts to beep at short intervals, and the LED flash starts to flash for . After that, in order to save power, the equipment automatically shut down. This device allows for a quick transformation from the scubadetector into a pinpointer, save your time and money. With the dive mode and the sensitivity has 3 level to adjust, you can change it for your different needs. Working principle: pulse induction Operating frequency: 3khz Waterproof level: IP68-60m Power supply: 1x9V battery (not included) Detection mode: audio, vibration, Audio + vibration, LED Sensitivity: 3 level adjustable Color: Orange & Black Material: Metal+Plastic Package Contents: 1 x Underwater Metal Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.