The Bresser Optik Biolux USB Microscope with 4x Digital Zoom has been designed so that several people are able to view your findings simultaneously via the high-quality 8.9cm (3.5") LCD Monitor. Manufactured with two LED lighting units, the lighting for this impressive microscope can take place in three ways as you are able to illuminate the object from underneath, above or both. The transmitted light unit is used for transparent preparations (preparations on glass slides). In order to see solid, non-transparent objects, select the top illumination unit. The top illumination unit is only useful when using the 4x objective. The use of both lighting at the same time is only useful with semitransparent objects. This mode of operation is not recommended for transmitted light objects on slides, as this can lead to reflections on the slides. You can take photos or record your observations as a movie sequence. The device has a memory card slot for SD cards and a USB port. Magnification 40 - 400 fold, the digital zoom goes up to 1600 times (4 times digital zoom!). It comes with extensive accessories and a practical nylon bag. This microscope provides a magnification range of 50-500x and 2000x for digital observation. The AC powered microscope has an LED light for proper illumination and is compatible with external storage (SD card) of up to 32 GB.