The Bark Limiter by Tri Tronics is smaller, lighter, effective and reliable. Fits all breeds and uses 5 levels of extended momentary stimulation that delivers the message that excessive barking is not allowed. Adjustable stimulation level changed at the push of a button to adjust for each dog. Built-in LED indicates the level of intensity. Long and short contact points and user-replaceable lithium batteries (included). The Bark Limiter is waterproof. Replacement 3 volt lithium battery sold separately.