The sound on these clickers works well. The problem is that the click button is in the wrong place - it's backward. If the wrist band is around your wrist, then the clicker is closest to your wrist, and the "push" part of the button is facing you (not away, like you need it to). So, to make it click, you have to put the narrow part close to your wrist and point out the part where the click button is (which is attached to the wrist band, so it's super awkward). We leave these lying around the house for when our pup does good stuff, so we worked around it. But if you want it on your wrist for training or walking, it's not useful.
I’ve had these for 4 days now and my dog is already responding so well. I thought I only needed one but ended up loving that they comes with so many. The whistle commands and clicks for good behavior are so effective and it’s convenient to have them all in one and always handy throughout the house.
Some clickers have been criticized as not loud enough or too large in hand. Not these. All 10 work just fine, and the click is plenty loud - just right in my opinion. Also, the size is perfect: 2.75" long, 1.25" wide, and ¾" thick. Wrist band looks small in the picture, but it's very stretchy and comfortable. Just got them, so I can't speak to durability yet. So far, I definitely recommend these.