K&H Pet Products Lectro Kennel Heated Pad with Free Fleece Cover Ideal for doghouse, kennel, garage, basement, or porch use Internal thermostat keeps temperature to a comfortable 100 Three Sizes: Small (approximately 12.5" x 18.5"), Medium (approximately 16.5" x 22.5"), Large (approximately 22.5" x 28.5") Uses Approximately 60 Watts