NoShark Formerly Electronic Shark Defense System (ESDS).
Now new and improved shark deterrent technology.

Sharks possess a sense called electroreception that allows them to receive very small electrical signals. NOSHARK works by emitting a high voltage proprietary signal to deter sharks. It is a small device worn around the ankle that works for hours with just one charge. Our research concluded signal strength alone is not an effective means to deter sharks. Equally, if not more important, is the signal wave form.

The device sends out an electric pulse that short-circuits the gel in a shark’s nose.

The device, which measures two inches by two inches and weighs about seven ounces, is designed to be attached to a surfboard leash, but also can be used by divers.

The device has been tested on more than 40 sharks ranging from six to 11 feet in length.

It comes with a built-in battery that lasts 5 to 7 hours and can be re-charged just like a cell phone.

Product Specifications

Dept: 150 feet maximum
Dimensions: Approximately 2.65”W X 2.30”H X 1.15”L (enclosure only)
Weight: Approximately 7 oz.
Power: Internal 3.7V Li-ion battery
Battery Charger: 5 VDC, 1.0 Amp wall transformer
Charging Time: Approximately 7 hours (new battery, varies over time)
Operational Time: 4 to 6 hours (in water)
Output: 120V to 200V pulsed proprietary wave form
Electrodes: 2 electrodes, each approximately 1” X 1” stainless steel mesh

NoShark Brochure Learn About Our Product and How It Works

SHARKS are extremely sensitive to alternating electric fields. A potential gradient of only 0.1 µV/cm is sufficient to evoke in Scyliorhinus canicula a reflex contraction of the eyelids (“winking of the eyes”), and to affect the respiratory rhythm of Raia clavata (“spiraculum reflex”). Such a weak electric field is perceived with the ampullae of Lorenzini. The ampullae are not only very sensitive to thermal and mechanical influences as found electrophysiologically, but also respond to electrical stimuli.
“Electro-perception in Sharks and Rays.” Nature 212, 1232 – 1233 doi:10.1038/2121232b0

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