When considering bark collars you should take a look at the PetSafe Standard Bark Collar.
It is easy to use and has no external controls, requires no programming and includes progressive correction built it. But what does this mean? If your pup continues to bark the static stimulation increases on its own in order to deter your dog from barking on and on.
When your dog barks, the collar gives a warning beep and a small stimulation. Then if she continues to bark, she will receive the warning tone with a slightly stronger stimulation. This process will continue up through 6 levels of correction. Not at all harmful but an effective deterrent to excessive barking.
This dog collar helps your furry friend learn the difference between good barking, for protection as an example, and bad barking which is often due to boredom or over-excitement.