I have two large dogs,a Labrador and a German Shepherd both are changing there habits of barking. the batteries last along time 6 to 8 days best I have had.

These work great. As soon as I put them on their whole mood changes and they don’t bark. Neighbors really appreciate it

Addendum, owner of product reached out and provided resolution for this product.

The shipping is very fast, my puppy looks comfortable when wearing it because its not too big, and my puppy has gotten much more fun after wearing it is very curious about this collar.

My dog likes to bark loudly when he can't see me when I am sleeping at night.I often make noise with my neighbors, and they often come to complain to me.I had to buy this barker, and it seems to be working. My dog doesn't make so much noise at night.

works better than expected!