smart caregiver cordless floor mat pressure pad with economy cordless alarm (no alarm in patient's room), gray, 24” x 48” smart caregiver corporation high quality cordless floor mat, features beveled edges and non slip surface, which helps to avoid slipping or catching with the foot or a walker. floor mat sends a wireless to the alarm monitor which can be up to 150’ – 300’ feet away. always test first to make sure monitor receives signal and to make sure you do not have anything that interferes with the signal. one of the great benefits of this system is that it allows the caregiver to relax and sleep, knowing they won't miss their patient trying to get up or go out! system operates on 3 c batteries, (not included) but to reduce the amount of batteries you will use for your alarm, you might wish to purchase an ac adapter for this alarm unit.