The Optimum 4000 is the best choice to fight bad smell inconvenience. It distributes the neutralising odour of the cartridge by means of a built-in compressor. This can be adjusted without fixed positions, so that you can dose very precisely. The Optimum 4000 is supplied with a 90 gram cartridge. The service life is determined by the applied position. Suitable for rooms up to 750 m³. A refill cartridge can be ordered or you can refill the used cartridge with Smell-Away.