If it's mounted to your ankle, and the shark is REALY hungery, wouldn't this get you bit in the head :>
If they have this technology, someone should check into floating bouys around popular swimming areas that sharks are known to frequent. Alot better than killing an animal for following it's instincts.
$.02

: Electronic Anti-Shark Units for Swimmers
: Launched
: Wed Mar 27, 7:47 AM ET

: SYDNEY (Reuters) - An Australian firm unveiled an electronic shark repellant
: unit Wednesday that
: attaches to a swimmer's ankle and emits an electronic field to ward-off
: sharks.

: The electronic shark repellent unit is a miniature version of cumbersome
: anti-shark pods used to
: protect triathletes in Sydney Harbour during the 2000 Olympics and worn by
: abalone divers.

: The personal anti-shark unit weighs 450 grams (one lb) and has a battery life
: of two hours. A slightly
: larger unit for scuba divers weighs 590 grams (1.3 lb) with a battery life of
: four hours.

: The swimmer's anti-shark unit will retail for about A$700 (US$240), said
: SeaChange Technology Pty
: Ltd which has miniaturized the original Shark pod technology developed by the
: Natal Shark Board in
: South Africa.

: SeaChange said testing of the electronic shark repellant units in waters off
: South Australia and South
: Africa, both renowned Great White habitats, showed sharks were repelled at
: about two to three
: meters (six to nine feet) from a swimmer.

: The diver's pack repelled sharks at four to five meters (12 to 15 feet).

: The electronic field affects the shark's nervous system through sensitive
: receptors near its snout. An
: initial mild discomfort increases as the shark approaches the field until it
: causes intolerable muscle
: spasms.

: "It puts out a very precise electrical field that sharks perceive
: because of a hunting sense they have,"
: Jerry Kleeman, managing director of SeaChange, told reporters.

: "So as sharks get closer to you they will veer away very rapidly as it
: becomes uncomfortable for them,
: but it doesn't cause them any lasting harm. It also does not impact on any
: other marine creatures or
: humans."

: SeaChange is working on electronic shark repellant units which can be used to
: create a safety zone off
: the back of boats and yachts and a larger version for beach protection.

: "Apart from protecting human lives, the beach protection units would
: enable the removal of existing net
: and hooking systems that are responsible for the slaughter of a range of
: marine life, including protected
: species such as whales, dolphins, turtles and dugongs," said the company
: in a statement.

: SeaChange sports a variety of investors, including Adelaide-based Gerard
: Industries and Playford
: Capital, joint owned by software giant Microsoft Corp, computer management
: firm Electronic Data
: Systems Corp and the Australian government.