Super strong and stylish dog whistle and clicker neck lanyards are available here:  Tough Paracord Neck Lanyard for Dog Whistles & Clickers, ID, Keys, Braided Knot | eBay

DogCatz Paw Dog Clicker Training, Puppy Obedience, Adjustable 
Volume, Cat, Recall Bark, Stop Barking, Tricks

Dog Puppy Clicker, Pet Cat Training In Obedience, Dogs Paw Clickers, 3 Volume Levels - YouTube

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Great fun for you and your pet

          * Three volume levels
       * Train to sit, come, stand, lie down and many more
       * Designed for Dog Training, Start them off when puppies
       * Fantastic gift for children - would be a great stocking-filler 
       * Suitable for all dogs
       * Interactive behavior training between you and your dog
       * Teaches repeated good behavior
       * High quality training aide
       * Based on proven scientific concepts
       * Teach your dog tricks

High quality, beautiful feel. You press the middle button, that will make a sound.  When you are training your dog, you click when they do something correctly and then reward. The dog associates the click sound with a reward and if trained properly should come to you when you use it.

Clicker training is a popular way to train your dog and reward his good behavior. It can be fun for you and your dog and often produces quick and effective results. Clicker training is based on the scientific concept that an animal will continue to do a behavior that is rewarded. Once your dog understands what the clicker is all about, you will be able to teach him all kinds of tricks with plenty of rewards along the way.