Pawz Away PetSafe Mini Add-A-Barrier 2pk Adjustable barrier range protects areas up to 5 feet in diameter Waterproof and battery operated barrier fits easily in small spaces Lightweight, waterproof receiver collar with progressive static correction (sold separately) Adjustable collar fits pets 5 lbs or more with neck sizes 6"- 28" (dogs), up to 12" (cats) Distinct settings for multiple pets