8 Ohm, 2 watt. 18mm x 52mm x 14mm. This is our new BASS REFLEX TYPE speaker, specifically designed to fit the narrower hood of US locomotives. It is also equally useful in any narrow space, such as a steam locomotives boiler, or a switching loco. The fitting lugs can be removed with a razor saw, or used with the integral isolation grommet to screw fit the speaker in place.