Powerful Refrigerator Air Purifier with Built-in Micro CPU Features: A revolutionary ozone generator to eliminate odors, keeps food fresher longer and kills bacteria in your refrigerator Naturally kills odors without any cover-up scents or fragrance Reduces food spoilage and prevents cross-contamination of food odors Extends the freshness and life of many foods three to four times longer Breaks down pesticides and herbicides on produce Built-in micro CPU intelligently controls the operation cycle Four D batteries lasts for about four month's operation Easy maintenance with no costly filter to replace ever Technical specifications: Rated voltage: 4 x "D" (6.0V DC) Power consumption: maximum 1.0W Dimensions (H x W x D): 130.5 x 123.5 x 73mm Weight: 0.22kg