It signals with pulses of vibration only

KOSS headphones

Model: CM-029

A soft rubber hand grip is placed at the end of the handle for comfort

Galvanized finish resists saltwater corrosion: built for surf hunting and wet sand conditions where uncoated steel would rust after a few sessions

Mars Sniper 10"x6” DD Waterproof Search Coil for Fisher F2 and F4 Metal Detector 1280x It signals with pulses ofMars Sniper 10 x 6 DD Search Coil with Nut & Bolt, Coil Cover, 2 Rubber Rings, and a Two Year Warranty. Compatible with the Fisher F2 and F4 Metal Detector. The Mars Sniper coil allows for the detecting of targets efficiently in complex environments (areas with thick vegetation, sites highly contaminated with iron, ruined buildings, attics and vaults). Mars search coils are 100% waterproof and are protected against electrical interference. Compatible