The AXIWI devices feature an 'S' button that toggles the speaking function on or off with a 1-2 second press. This is particularly useful in sports settings where certain users, like a 4th official, may only need to listen, keeping the microphone from being constantly active. For those needing to speak or join a conversation, the device offers a large, ergonomically designed PTT (Push-To-Talk) button, model OT-015. This PTT button provides a more convenient, quicker, and easier way to control the speaking function compared with the 'S' button.