Aodma ST-807 Air Sterilizer works on ozone technology and offers 3-way air-flow. This product is best suited for an enclosed area such as shoe rack or refrigerator. It will effectively eradicate the bad odour and revive the environment. Air sterilizer for allergies is a great product when it comes to affordability and effectiveness. Once charged, it can be used for 7 days. Just place it in the area and press the power on button. The home Air sterilizer will work automatically and kill bad odour & refresh the surrounding. It enters standby mode automatically and resumes working mode after a particular span of time spontaneously.