I was looking on the Internet for a timer to buy for my mother that would alert her to several different time settings during the day.  I wanted to do that because my mother needs to be reminded to take her medications several times a day, and she has been having trouble remembering to do that.  So I found a great invisible clock on the low vision assistive technology webpage of the Enablemart.com website.  It can be set on vibrate to discretely alert her when she should take her medicine.

This website is dedicated to providing assistive technology products to people who have physical impairments.  It sells items such as large key computer keyboards and talking watches, screen magnifiers and many more non-computer related products to assist people to perform their daily activities.