I found the following on a well known site and have copied and pasted portions of it here. Take a look underneath the heading of Features, on the seventh line down???
The Fisher Coin Strike is a state of the art metal detector. It offers programmable notch discrimination, digital target ID, Wet Salt Beach operation and many more features. Deep Seeking and Target ID! What more could you expect from the worlds leading metal detector manufacturer?
Features:
4-Tone Audio Target ID
Numeric Target ID - Averaging Function Control
Precision Auto Ground Balance System
Accurate Numeric ID in Both All-Metal and Disc Modes
Programmable Notch Discrimination
Handle, Belt, or Chest Mount
Dual VLF Frequency
Programmable Interface:
Last-Setting, Favorite Setting and Factory Preset Memory Feature
Wet-Sand, Salt Beach Mode
High Resolution Iron Discrimination
Fisher Lifetime Warranty
COIN STRIKE SPECIFICATIONS: Weight: 3.5 lbs.
Length: 52 inches extended. 41 inches collapsed.
Batteries: (2) 9 volt alkaline. 20-25 hours.
Standard 8 inch spider coil-waterproof.
LCD Panel: 3x2 inches with constant control read-out and backlight.
Frequency: Target response: low tone=iron. low/mid tone=foil, nickel, round tabs. mid/high tone=square tabs, zinc. high tone=copper, clad, silver coins