This ebay listing is for:
-the Tail Pad which is compatible with the Power Module (sold separately), and
-the Decal Antenna.

Condition:
These items have been unboxed for inspection and photographing.  They have never been used. 

We are selling on ebay:
  • 2 x Tail Pad / Decal Antenna (this listing)
  • 2 x Power Module (see seller's other listing)
  • To buy a bundle (1 x Tail Pad / Decal Antenna + 1 x Power Module) at a discounted price of A$499 + shipping, contact seller.

If you're buying a Shark Shield, you've already done your research and you know these things work.

This is what Ocean Guardian have to say about the Shark Shield:
  • The world’s most scientifically proven and independently tested electrical shark deterrent. Nothing is more effective.
  • Creates a powerful electrical field that turns sharks away.
  • Proven to deter Great Whites, Tiger Sharks and Bull Sharks.
  • Easy to install on old or new boards. No need to involve a shaper.
  • Sticker-thin (≤ 600 microns) adhesive decal antenna adheres to the underside of your board and connects to the Tail Pad. No impact on surfing performance.
  • Transferable Power Module (sold separately) can be removed for charging and used on any board fitted with the Tail Pad / Decal Antenna.
  • A foam insert (included) can be used in the Tail Pad kicker for those surfs when you don’t want to use the Power Module.
  • No known permanent harm to sharks and does NOT attract sharks.
 
Check out independent research, for example this short youtube video:
https://www.youtube.com/watch?v=VIV6DAE-L0k&pp=ygUMc2hhcmsgc2hpZWxk

Instructions on how to install a Shark Shield FREEDOM+ Surf on your board:
https://www.youtube.com/watch?v=9wF7-NatEy0

If you're still here and want to read a scientific article, check this out:
https://www.nature.com/articles/s41598-020-74799-y
TLDR - Shark Shield is the most effective shark repellent out there :)