Review on U-Likee Set of 6 Colors Dog Buttons - Recordable White Noise - Train Your Dog with Customizable Messages (Includes Battery) by Adam Walsh

I have practically no problems with this product! They work very well and are easy to record and re-record. My only "complaint" (and it's a VERY small one) is that I'd like the button colors to be in shades that dogs can actually tell apart. For example, green and red look the same to dogs, but they CAN distinguish different shades of blue/purple, yellow, and black/grey/white. I know this is an unfair complaint as to the actual quality of this product. That's great, but I think it's still worth mentioning.