Deep Blue Underwater Treasure Hunting Metal Detector Totally Water Proof Fully Waterproof with Carry Bag Headphone Fully waterproof, can be used up to 65 feet under the salt water or fresh water. Motion detection has relatively low requirements on environment. Sensitivity adjustment function enables the detector easily adapted to different environment. Discrimination adjustment function enables the elimination of unwanted metal. Water-proof detector and headset enable the underwater detection Weight 5lbs. Comes with onboard internal waterproof battery pack (8 AA Batteries included), submersible headphone, carry bag and instruction book. Work environment: salt water, fresh water, land. Frequency: VF-Search 2.4 kHz, Quartz Crystal Controlled Audio, Target Response 400 Hz. Audible alarm and visual red LED flash. Aluminum control tube. Can be set to ignore small metal pieces while looking for larger objects. Discrimination capabilities to tune out trash like pull tabs while searching for valuable treasure. Suggested Retail: $399.99