A cox box is an electronic device used in competitive rowing that combines a digital stroke rate monitor, stopwatch, and voice amplifier.[1] It is generally used by a coxswain to monitor the crew's performance, and amplify instructions given by the cox using a microphone and series of wired loudspeakers.[2]
Although the term "cox box" is often used as a generic descriptor of this type of device, multiple companies have registered trademarks of similar terms.[3] For instance, Cox-Box, CoxBox, and Cox Box are all registered trademarks of Nielsen-Kellerman.[4]