The deluxe little dog bark control collar uses nanotechnology to make it lightweight and small so it fits comfortably on small- and medium-sized dogs. Patented technology ensures a dog"s bark is the only sound that will activate one of the ten levels of static correction. Correction begins at the lowest level and increases if barking continues. Collar remembers the level of correction that made the dog stop barking so when the dog barks again, the collar starts correcting at the remembered level. A safety time out will shut off the correction for three minutes if the dog barks more than 15 times in 1 minute 20seconds. The new design is nylon web. Both collars fit neck sizes up to 16-inch and dogs that weigh 8-55-pounds.