gearbox

Example:He replaced the transmission in his old car to gain better performance.

Definition:A mechanical device that transfers the output of an engine to an output shaft, often found in vehicles and machinery, which includes a set of gears that can change the speed and torque for different applications.

Example:The radio transmitter sent signals over long distances.

Definition:All devices that send signals, often incorrectly used as a synonym for gearbox, but typically refers to electronic devices.