These large sensor pads are designed to meet the most demanding of long term use. They are designed to stay put, meaning fewer false alarms. Smaller pads have a tendency to slide in a bed or chair, but these large pads stay securely under the patient, while allowing them to shift positions and not worry about setting off the alarm. In addition to more freedom of movement for the patient, larger pads allow better placement for the caregiver. Pads can be placed near the back of the chair for more sensitivity or under the patient's shoulder area for early warning of patient wandering. Both pads come with a 6 month guarantee.