Cox box

A cox box is an electronic device used in competitive rowing that combines a digital stroke rate monitor, stopwatch, and voice amplifier. 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.

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. For instance, Cox-Box, CoxBox, and Cox Box are all registered trademarks of Nielsen-Kellerman.