AWFUL!
I have a hearing disability so I was thrilled to see that there was a monitor that vibrated. It was the obvious choice for me. We set it up and haven't used it until recently. We do NOT use batteries and keep it plugged in at all times. In order to be woken up to hear my son crying in the morning, I have to have the monitor LOUD. I can not turn it up high enough to hear my child with out a loud piercing whistling sound. Instead, I have to set my alarm for every 30 min and then press the monitor to my ear to hear if my son is waking up or not. This was an expensive item! Dont waste your money.