(Einstein E-Collars) The perfect solution for those dogs that like to over-communicate. It utilizes a patented low-current stimulation technique to condition the dog not to nuisance bark. By setting the stimulation to the correct level, protection barking will continue while unnecessary barking is eliminated. The Auto-Mode feature makes it simple for all dog owners to use with confidence. 100% waterproof and shock resistant. Four levels and Auto-Mode. Easy to use. Completely rechargeable.