yes, it gives you data real time. if you do not want to use a ear piece, it will repeat all the parameters on a set interval that you program, every 30 seconds or 60 seconds, let's say.
also, if you have a friend next to you, while you fly, they can look at the numbers.
also, you can program alarms, let's say, head temp gets over 200, it will start to buzz, if receiver pack voltage starts to drop under a level you program, then it will make a different warning sound, etc....