This project was initiated by LSCM, the Hong Kong Textile and Clothing Research and Development Centre, and ASTRI. With the use of RFID technology, this detection system is developed specially for the elderly homes or centres to detect the location of the elderly with dementia. The elderly wearing the vests with built-in RFID tags will be detected automatically in case they wander away from the elderly homes or centres without permission. Staff of the elderly homes or centres will register the information of each vest using a RFID reader so that the location of the elderly can be detected by the system. Antennas are installed at the main exits in order to detect the RFID signals from the RFID tagged vest. If the elderly wearing the RFID tagged vest leaves the elderly home or centre without permission, the system will alert the monitoring staff by providing an alarm, then he/she can stop the elderly from leaving the elderly home or centre immediately. This technology provides a more effective control compared to manual observation and can release the pressure of the caretakers in looking after the elderly. In addition, the user interface of the system is simple and easy to use, therefore, it does not require much training for the staff.