After seeing another deal on here for a cheaper version I thought it was only right to share my experience of these devices after owning many:
Concept = Brilliant
Design = Sometimes Shocking
Firstly I use blinkers on my 2 dogs because I find any other illuminating device is not as effective as these.
Dog collars that light up are good but are covered up by the dogs hair when they run or walk so you can't see them
There are many blinkers on the market however the common fault I have found is that the spring loaded clip normally used to fasten these to your dogs collar is too thin and after a while snaps and breaks.
I had had this with countless blinkers I used to purchase from pets at home for £3.99 each.
Now my dogs roll around in mud, run for miles and swim through rivers so I needed something durable which is when i found these.
They have a reinforced clip so they are sure never to break, they are super bright during the night and best of all they are waterproof
I have had mine 3 months now and by far the longest a blinker I have owned has survived with 2 springer spanels
Take my advice, don't waste your money on the spring loaded clips or the plastic ones they won't last