STR-SOLUTION generates and emits active ions into the surrounding and volatilizes the air directly. It effectively destroys any pathogen either in the air or on any hard surface. The model W-7700 is designed as stand-alone and portable. It is light weight and can be conveniently placed at any indoor application. It is simple to use hi-tech device and only entails plug and start. It does not require any additional or replacement accessory.