Multi-function detector: The MD4030 metal detector has two operating modes, full metal mode and recognition mode. Full metal mode can detect a variety of metals, while recognition mode can help you identify different types of metals, providing more accurate detection results. Custom volume: This metal detector is equipped with volume adjustment function, you can easily adjust the volume of speakers and headphones according to your preferences and needs. Whether you use it indoors or outdoors, you get a clear and comfortable sound. Headphone jack: The MD4030 metal detector provides a headphone jack for use in a quiet environment. By connecting headphones, you can listen more intently to the sound emitted by the detector and not be distracted by the surrounding noise. Intuitive pointer display: This metal detector is equipped with a pointer display function, when metal is detected, the pointer will swing as the metal is found. This intuitive display allows you to quickly and accurately determine the location and size of the metal. Waterproof design: The MD4030 metal detector has a waterproof detection disc and can be used in shallow water. Whether near the beach, river or lake, you can safely use this detector for metal detection without being affected by water. Adjustable rod: In order to adapt to different height and use needs, the MD4030 metal detector is equipped with adjustable rod, you can easily adjust the length of the metal detector according to your height and use scenario, to ensure a comfortable operating experience. These features make the MD4030 metal detector a feature-rich, easy-to-use metal detection tool. It is suitable for a variety of occasions, such as treasure hunting, archaeology, indoor and outdoor metal detection, etc., but also suitable for people of different ages to use, whether it is professional detection personnel or enthusiasts, you can get fun and practical. Specification parameters: 1. Power supply: 2 x 9V (6F22) 2. Frequency: 5.0 KHz 3. Current: Static: 10mA Max. : 70mA 4. Voltage: 7.2-9.6V 5. Sensitivity: US 25 Cent: 130mm 6. Display mode: mechanical pointer mode Sound pattern 7. Extension length: 30.7-42.1 inches 8. Probe disk diameter: 6.5 inches 9. Color: Black