PetSafe Heated Wellness Cushion, Little Dog Ultra-comfortable cushion provides your small dog with warmth and comfort year-round Safe low-voltage warmer delivers comfortable heat for extended periods Special relief for older dogs with aching joints No assembly required; For use in the US only. This unit is compatible with all US 110v outlets and are not to be used with 220v international voltage. Includes washable 2-sided cover, chew-resistant power cord, and 1-year warranty