The Heaven Fresh HF 10 Refrigerator Air Purifier is specially designed both to neutralise reproductive capability of bacteria & viruses & to reduce unpleasant odours inside your fridge. Silent in operation & not requiring filter changes, the HF 10 kills 95% of fungi, bacteria & mould from contaminated food inside your fridge, thus lessening the chances of your family suffering from food poisoning. Its microprocessor-controlled 2-hour air cleaning cycle helps to preserve food in your fridge for a considerably longer period, thus preventing food waste & saving you money. Specifications of the Heaven Fresh HF 10: Fridge capacity covered: 250 L Ozone concentration: <= 0.5 mg/cm 3 or <= 0.08 ppm Power source: 4 type C batteries (6 W) Power consumption: continuous operation for 3 months with each battery change Rated voltage: DC 6 V Dimensions: 13 x 6.5 x 8 cm Weight: 190 g