content: Even though "Talking Caller ID" is printed right on the unit, it won't actually speak the Caller ID (the phone number of the person calling) to you.If you have recorded a personal name tag for a particular number it will play that, but if you haven't, it just remains mute. You can press "Review" later and hear the number announced, but it won't play it while the phone is ringing, which is when you need to hear it.