Add the on call busy light and you'll have less interruptions and more productivity! When on a call the Jabra busy light will illuminate red, letting others around you know not to disturb. Once finished with a call the red LED light will turn off and people will know you're free to talk. That means no one will walk into your office or cubicle again and start talking when they see the red light! That's good for you, good for business and even better for your customers.