We had these with our jack russells for years: basic things like outside, walk, car ride, etc. It took a while for my jacks to pick up the idea but after about 3 or 4 months they would start pressing the outside button without interaction from me. I would let them outside and give them rewards. Success!

But oh no. Now the dogs think it's a treat button. I hear the outside button go off, I walk into the kitchen and then they run directly to where the treats are and wait. So that's an annoyance.

They started to figure out that they couldn't just push the button and get a treat. They had to push the button and THEN go outside to get a treat. So they would push the button, go out of the back door and stand on the patio then come back in and run up for treats.

Then the buttons get scootered around on the floor. I'm in the kitchen making dinner and I bump into one of the buttons and OUTSIDE blasts crackily from the speaker. Now all the dogs come running to the back door because they think it's treat time. And don't bump into one of the middle of the night when you're trying to get a snack out of the fridge for yourself, you'll hear all the dogs run downstairs because hey it's treat time again!

I think it's a fun game to be able to communicate with your dog in such a way but I probably won't buy them again. We ended up just buying one of those little hotel bells to put on the floor. When he wanted to go outside he would ding the bell, which was good enough.

I was actually considering buying those, because one of our dogs has the habit of suddenly jumping up at me, whining, desperately wagging her tail, looking at me with those huge doggy eyes, running in circles, digging at my forearm etc. - anything to make me understand that she really, really must have that thing right now. She just won't for the life of her tell me what it is that she needs.
So even if the buttons may be annoying in most cases, they might still make sense in our case. The challenge will be to teach the other dog not to press the food button every minute.

Haha what else does your dog communicate with them?