PetSafe Elite Remote Trainer for Small and Medium Dogs Under 40 lb. with Tone and Static Stimulation, Waterproof and Rechargeable 400 YARD RANGE - flexible enough to work for indoor training or for outdoor hiking with your dog 15 ADJUSTABLE LEVELS - static stimulation and 1 tone (beep) level to teach commands and correct behavior WATERPROOF COLLAR - for all of your dog's outdoor activities RECHARGEABLE BATTERIES - collar and remote use built-in rechargeable batteries that are full charged after only 3-4 hours TRAIN UP TO 2 DOGS AT THE SAME TIME - with additional collars sold separately; PetSafe Elite Little Dog Add-A-Dog PAC00-13631 and PetSafe Elite Big Dog Add-A-Dog PAC00-13632 FOR SMALL AND MEDIUM DOGS- designed for dogs under 40 pounds; Fits neck sizes up to 22" Manufacturers warranty is only valid when purchased from an authorized retailer