ChunHee Dog Bells to Go Outside,Dog Door Bell for Dogs to Ring to Go Outside,Bells for Dog Training to Go Outside,Dog Bell with 55 Chimes, Adjustable 0-110db,2 receivers & 4 Dog ButtonsLife changing dog bellsChunHee dog training bells for door responds to a gentle touchespecially suitable for puppy bells for door potty training. Include training suggestions and detailed instructionsenjoy dog Trigger SimpleLarger triggering area and more sensitive triggering designdog bell for door potty training say good bye to scratching, whining, barking or noisy ringtone. Adjust Volume & RingtonesThe receiver offers five volume levels from 0 to