I absolutely love this device; they are an important part of my training. I typically will use two at the same time (one remote and unit has a little red dot on it to tell the units apart). I have a Treat & Train, but I have tiny dogs which means tiny treats. The Treat & Train dispenses too many at once. I have two of these. A couple of years ago, I had a problem with one of the remotes; it didn't pair with the unit. Clip and Go was very fast in their response and sent me a new unit. Wow! Fast forward to the present. I once again had a problem pairing one of the remotes. I tried "new" batteries I keep on hand. That did not work. Since this was the second time I had the problem, I wrote a review here. I was immediately contacted by the staff to trouble shoot the device, They told me that if we could not get the unit to work, they would send me a new unit. WOW!!!! I decided that I would give the unit one more shot, so I bought new batteries at the store and tried to pair the remote again. Success!!! The moral: get new batteries at the store first. I know the batteries were "new" but apparently not new enough. Thank you Clean Run for standing behind your products.