Olympus 75-300mm f4.8-6.7 II is an Auto Focus (AF) Telephoto Zoom lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 150 - 600mm. With the max apertures of only f4.8 at 75mm, and f6.7 at 300mm, the lens is quite slow at both ends.
Olympus 75-300mm f4.8-6.7 II is not a weather sealed lens, so you have to be extra careful against rain and dust.