Fisher CZ-21 Fisher Quicksilver w/8in Search Coil Black Standard. The CZ-21 also has Audio Tone Target-ID a highly sought after feature that allows users to distinguish iron targets from gold. The CZ-21 delivers Specifications for Fisher CZ-21 Metal Detector: Manufacturer: Fisher Included Accessories: Headphones Water Resistance Level: Waterproof Finish: Black Battery Type: 9v Battery Life: 10 - 55 hours Water Resistant Mark: 250 ft Battery Quantity: 4 Features of Fisher CZ-21 Metal Detector Saltwater or Fresh Water Submersible up to 250 feet Dual Frequency Fourier Domain Signal Analysis Touch-Button. V.C.O. no Motion Precise Pinpointing Easy Manual Ground Balance High Performance in Mineralized Soil All Metal Auto-Tune Mode Large Target Alert / Faint Target Audio Boost 3-Tone Audio Target-ID Removable Control Housing for Belt-Mount 8 and 10 Coil Options Operating Frequency: 5 and 15 kHz Length Extended: 50 Length Collapsed: 30 Control Housing Weight: 2.8 lbs Complete (with headset): 8 Coil 5 lb 11 oz 10.5 Coil 6 lb 1 oz 5 Coil 5.4 lb Handle and Search Coil: 8 Coil 2 lb 6.9 oz 10.5 Coil 2 lb 12.9 oz 5 Coil 2.1 lb Frequency 1. Dual VLF Search 5 KHz and 15 KHz 2. Audio Target Response Iron I.D.: 200 Hz (Low tone) Foil and Tab I.D.: 450 Hz (Mid tone) Coin I.D.: 1 KHz (High tone) Autotune: 500 Hz - 1 KHz (VCO) Pinpoint: 500 Hz - 1 KHz (VCO) Operating Modes 1. Autotune - VLF-Motion all-metal with threshold tone 2. Target I.D.: VLF-Slow Motion Silent Search Discrimination 3. Pinpoint: VLF All-Metal No Motion Search Coil Type: Concentric Co-Planar Diameter: 8 10.5 or 5 Shielding: 100percent ESI Interchangeable: No Headset: Waterproof Piezo Electric Interchangeable: No Ground Balance: Touch Pad Manual or Preset Control Markings Hipmountable Control Housing: Yes Salt Water/Fresh Water Operation: Yes Land Operation: Yes Submersible: to 250 feet Package Contents: Fisher CZ-21 Metal Detector Fisher CZ21-8: CZ-21 Fisher Quicksilver w/8in Search Coil Black Standard