two-speed

adjective

(of a transmission system) having two settings
(of an economic system) allowing one sector to grow at a faster rate than another

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for two-speed

Historical Examples of two-speed

This arrangement gives six spindle speeds, and double this number is obtained by using a two-speed countershaft overhead.
Turning and Boring
Franklin D. Jones
The gear-ratio of a two-speed gear is the ratio of the high to the low gear.
Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7
Various
In some two-speed gears the normal is the high speed, in others the low.
Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7
Various
Two-speed and three-speed gears are now very commonly fitted to cycles.
How it Works
Archibald Williams
Fig. 14 is a sectional view of the “Hub” two-speed gear, the chain-wheel or free-wheel clutch being omitted.
Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7
Various