PetSafe Elite Little Dog in-Ground Fence Receiver Collar, for Dogs Over 5lb FOR LITTLE DOGS - fits dogs over 5 pounds with neck sizes from 6 to 16 inches^ADJUSTABLE, WATERPROOF -with 4 levels of static correction and tone only mod for training, receiver collar can be adjusted to dog's temperament^ADD UNLIMITED PETS TO YOUR SYSTEM - keep as many pets as you need safely in your yard with this add-a-dog receiver collar. Compatible with all PetSafe In-Ground Systems except YardMax and UltraSmart^REFLECTIVE COLLAR STRAP - adds visibility so you can see your pet better at night^LOW BATTERY INDICATOR - alerts you when battery replacement is required^Collar uses easy to replace RFA-188 battery^Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs at 1-800-732-2677 or by email at ccc3@petsafe.net^Manufacturers warranty is only valid when purchased from an authorized retailer