Anyone have/use a Fitbit that monitors heart rate?

The website doesn't have answers to my question. No chat feature there and I don't want to join a community to get a question answered.

Here's my question: Does the unit alert the user somehow if actual heart rate goes above a certain zone?

Could the user set a heart rate upper zone and have the unit alert them if the HR goes above that set zone? I'm wondering if it could be used as a biofeedback aid. HR goes above a zone, alerts the user and user works to lower HR to below the alert zone.

ChrisL