402E is a portable: hand-held: eco-friendly electronic blower thats an alternative to using compressed air for removing dust in hard-to-reach areas. This duster has multiple settings: balancing performance with battery life and unlike compressed air products: does not get cold during extended use. 402E is ideal for use around the home and office for cleaning dust: lint and debris on keyboards: audio visual: PCBs: telecommunication devices and lab equipment. It is also an excellent choice for repair and maintenance technicians and service providers.