Features: An innovative device utilizes ozone purification technology to purify the air inside your refrigerator Neutralize stale and foul odors with fresh air inside refrigerators, closets, bathrooms, and cars Very ideal for use in refrigerator to keep the foods fresh for longer time Kill certain types of bacteria to avoid the growth of mildew Built-in micro CPU intelligently controls the operation cycle and mode by one touch and indicates with the colored LED Run for about 90 days on 4 AA batteries No costly filter to replace ever Naturally neutralize odors without any cover-up scents or fragrance Very elegant and space-saving design Technical specifications: Model no: RK99 Rating voltage: 6V DC Effective range: 250L Power supply: 4 pieces 1.5V AA-size alkaline batteries Power consumption: ≤1W Dimensions: 76 x 67 x 120mm Weight: 135g