1. With IP68 waterproof rating, you can use this product underwater, not limited to the ground, expand your detection space. 2. Lost alarm function: With this function, you can find the device more easily to avoid losing it.If the button is not pressed or the device does not detect any target within 1 minute, the lost alarm be activated. The device starts beeping at short intervals,and the LED flash starts flashing for .After that, in order to save power, the device automatically shut down.The device allows a quick conversion from a scuba detector to a precise pointer, saving your time and money. 3. With diving mode, the sensitivity has 3 levels to adjust, you can change it according to different needs. With three detection modes: audio, vibration, audio and vibration, you can change the mode according to different needs. Working principle: pulse induction Working frequency: 3khz Waterproof rating: IP68-60m Detection method: audio, vibration, audio + vibration, LED Sensitivity: 3 levels adjustable Colour:Yellow Material:ABS Package Contents: 1 * control unit(without 1 x 6F22 alkaline battery) 1 * pointer coil 1 * diving coil 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.