metal detector underground metal detector MD-88 digital underground metal detector [1]Parameters 1. Rechargeable, Battery Life L.E.D lights, charging indicator lights. 2. Full-control Ground Balance. 3.could distinguish Ferrous and Non Ferrous metal 4. Be capable of remarkable depth and extreme sensitivity in the worst grounds. 5. Waterproof 15" search coil. Other accessory 12" coil available. 6. Threshold Control. Accurately adjust the audio to hear the smaller, deeper signals. 7. Frequency Control adjusts for hunting near power lines, microwave or other environmental interference. 8. English Panel, easy operation 9.Detect depth: 3.5 meters