I have both the in-home fall detector pendant and the mobile unit. I am very satisfied with the devices, except that the fall detector is extremely sensitive to movement. If you shorten the pendant cord as much as possible, then sleep with the pendant without fall detection, you'll be fine. The system is effective and easy to use. The information in the booklets for use of the system and testing is clear and easy to understand. Having previously used another company's system, I can tell you that this system is far superior and costs very little more.