Tri-Tronics No Bark Collars are durable and long lasting because they are constructed from high quality materials and designed in such a way that through normal use Tri-Tronics no bark collars will work for years to come. One of the more special features from Tri-Tronics no bark collars is the bark odometer which gives you a report of how often corrective measures were enacted so that you can tell how your dog is improving.