The kit contains: 1 pc SensorKlear cleaning pen 1 pc HB-1 manual air pump About the Sensorklear-2 sensor cleaning pen: The SensorKlear-2 is a precision tool developed for cleaning the CMOS and CCD sensors (the infrared filter surface that protects the sensors) of digital SLR cameras. It is absolutely recommended to use it together with the SensorKlear Loupe. With the help of the bendable head, we can reach the sensor through the opening of the SensorKlear Loupe, and thus we can follow the cleaning process with our eyes. SensorKlear can be used safely and effectively to clean the sensors of digital cameras, which previously could only be cleaned in specialized services. Sensorklear-2 is a cleaning tool based on activated carbon technology. ) binds it to its own material with a secondary chemical bond, a so-called van de Waals bond. During cleaning, the product thus does not spread fats and oils on the surface to be cleaned, but binds them and removes them. There is a sponge in the cap of the cleaning pencil, which serves as a container for the active carbon dry cleaning agent. The amount in the sponge can be enough for up to hundreds of cleanings (depending on the degree of contamination and use). Before using the cleaning pen, the cap must be firmly pushed onto the cleaning pen and twisted 1-2 times (as if it were threaded and we wanted to screw it on). In this case, the cap's sponge delivers another dose of fresh cleaning material to the cleaning head. The product is environmentally friendly, the active carbon compound used during cleaning does not flow and never dries out.