Features Pulse Induction Technology: Our metal detector has pulse induction technology to find in salt water or a variety of soils, including grass, dirt, sand, etc. Target Distancing: Metal detector at a frequency of the probe tip vibration increases the pulse proximity to precisely identify the target. Vibration and Light Communication: Handheld underwater metal detector in when the target is located signal with vibration pulse and bright white light flashing. Compact Design: 4inch coil, easy to carry, can detect various metals such as iron, silver and gold, etc. By pulse induction, it can transmit the vibration and blue pulse to the commanding. Wide Application: Handheld underwater metal detector is suitable for finding keys, jewelry, small metal objects, and can be used at the beach, in mountains, and when diving. Specification: Item Type: Handheld Underwater Metal Detector Model: PI750 Detection Mode: Pulse Induction Search Mode: Metal Alarm Mode: Vibration And LED White Light Working Power: 9V 6F22 Battery x 1 (Shipping Without Battery) Overall Length: Approx. 43cm / 17in Head Diameter: Approx. 10cm / 4in Package List: 1 x Handheld Underwater Metal Detector(Shipping Without Battery) Package List 1 x Handheld Underwater Metal Detector(Shipping Without Battery)