Feature:1. [TWO BUTTON DESIGN] Easy control, it can be turned on and off in one second, and switch modes in one second, easy to operate, and bring you a smart experience.2. [IP68 WATERPROOF RATING] With diving standards, it can completely protect the environment from pollution, and can also be operated reliably under 10-30m underwater in rugged environments.3. [SCIENTIFIC DESIGN] Instead of using traditional batteries, it uses rechargeable lithium batteries. The charging interface is micro USBA interface and Type‑C interface.4. [LONG BATTERY LIFE] With two lithium batteries, you no longer have to worry about running out of electricity when using it outdoors. The longest use time is 7‑10 days when it is fully charged.5. [WIDE SCOPE OF APPLICATION] Using impulse induction (PI) technology, it allows users to metal in water, land or any type of soil, and can be used in diving search, public safety inspection, investigation, professional archeology, positioning decoration, etc. Condition.How to Use:1. When starting up, long press the (on/off) button and quickly press the power button to change the sensitivity level between 1‑4 (the highest level). Each level will emit an additional beep, until the fourth level will emit a long beep.2. When powering on, quickly press the (F) key to switch between three different alarm modes (buzzer, vibration only, buzzer