Tianxun S9 Underground 3D Gold Detector Specs: Feature Claim / Specification Detection Type Gold, Silver, Jewelry, etc. — general metal detection. Frequency ~7.7 kHz operating frequency. Waterproofing Fully waterproof (search coil is waterproof) — underwater use is advertised. Search Coil Size A 12-inch waterproof coil (12″ DD coil) is specified. Detection Depth ≥25 cm for a US quarter coin (in ideal conditions). Power Supply Built-in lithium polymer battery (~2500 mAh) for S9 in some listings — rechargeable. Display & Indicators LCD sound vibration indicators. Adjustable Stem / Size Stem size is adjustable: about 50-132 cm (~20-52 in) for some versions. Materials & Build ABS plastic, aluminum frame components, etc. Standard for many detectors in this price range. Warranty 1 1-year warranty is claimed.
