The Wireless Fall Monitor is ideally placed on the wheel chair and then connected to a corded weight-sensing chair pad. The pad is placed under the resident and when the resident gets up from the pad it will send a silent, wireless signal to the caregiver pager. If the weight is re-applied to the chair pad, the monitor will automatically reset. The Wireless Fall Monitor and Wireless Pager system is designed to send and receive alerts remotely via wireless pager to notify the caregiver. Battery Operated (3-AA, Not Included). Optional AC Power Adapter (AC-05).