Olympus ED 9-18mm f4.0-5.6 is an Auto Focus (AF) Wideangle Zoom lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 18 - 36mm. With a max aperture of f4 at 9mm, we can not consider this lens fast on wide end and neither at tele end with its f5.6.
Olympus ED 9-18mm f4.0-5.6 is not a weather sealed lens, so you have to be extra careful against rain and dust.