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Dive Gear - Shark Shields - ESDS (Electronic Shark Defence System)
Online Store > Shark Shields

Electronic Shark Defense System ESDS

ESDS is activated by simply being submerged in salt water. It is rechargeable with an active life of approximately 9 hours. Attach to any limb or your gear for the ultimate shark protection.

ESDS is a new device that repels sharks. A new, effective, tested technology that will help keep sharks at bay. Great for swimmers, divers, surfers, or anybody with an aversion to sharks, everyone! Years in the making, lightweight, rechargeable, Electronic Shark Defense Systems has you covered.


ESDS Depth: 150 feet maximum
ESDS Dimensions: Approximately 2.65”W X 2.30”H X 1.15”L (enclosure only)
ESDS Weight: Approximately 7 oz, 198gm.
ESDS Power: Internal 3.7V Li-ion battery
ESDS Battery Charger: 6 VDC, 1.0 Amp wall transformer
ESDS Charging Time: Approximately 7 hours (new battery, varies over time)
ESDS Operational Time: 9 hours (in water)
ESDS Output: 120V to 200V pulsed proprietary wave form
ESDS Electrodes: 2 electrodes, each approximately 1” X 1” stainless steel mesh

Sharks possess a sense called electroreception that allows them to receive very small electrical signals.  ESDS 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.   After years of development and testing we believe our proprietary signal combined with sufficient strength makes ESDS extremely effective.

Longtime Honolulu surfer Wilson Vinano Jr. says he has come up with a way for surfers and divers to fend off sharks.

He has created the Electronic Shark Defense, which sends out an electric pulse that short-circuits the gel in a shark’s nose.

“What our product does is shock and thus interrupts a shark,” he said.

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.

Vinano, 55, said he has film showing that his invention works. He has tested it on 30 to 40 sharks ranging from six to 11 feet in length.

“We would send down a fish with a rope and it would grind the fish,” he said. “Then another one with the device on, they didn’t eat the fish but when we remove the device, they shred it.”

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

Frequently Asked Questions about the Electronic Shark Defense System

Q:    Can I change the battery of the ESDS?
A:    No, the battery is sealed within the unit.

Q:    How long will the unit last?
A:    The battery is rated for 300 charges.  If you swam twice a week for an entire year, the unit should last about 3 years.

Q:    What is the effective range of the ESDS?
A:    Our tests have shown an effective range of about 20 feet , sometimes much more.

Q:    Does the ESDS work with all species of sharks?
A:    All sharks have electroreception.  We have not been able to test the device on all species.  

Q:    Can I get shocked by the ESDS?
A:    ESDS emits a high voltage signal.  Touching the probes while the device is activated will produce a very mild electrical shock.  We caution users not to touch the probes or handle the device while it is activated.

Q:    I have a pacemaker, can I use ESDS?
A:    If you have any medical condition, please check with your physician before using ESDS.

Q:    Is the device guaranteed to work?
A:    It is impossible to predict what sharks will do.  However, our tests have shown ESDS to be very effective.  Nothing is 100% and we advise taking all necessary precautions while in the water whether you are using ESDS or not.

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