Through an advanced and simple tracing network, hope to rally the public to help find people with dementia who have gotten lost. It also serves to enhance public awareness of dementia and how to help people with dementia from getting lost, and move closer towards the goal of building a caring community. Features of ibeacon device: 1. No need to recharge everyday: the device uses low power consumed Bluetooth technology which is suitable for people with dementia to bring along with 2. Friendly design: iBeacon has 3 types for selection, light in weight and practical for use 3. Preview of battery power: Can monitor the battery power from the mobile app so as to manage the power supply as soon as it reaches to the low level 4. Easy to feedback on the traces of people who got lost: the Bluetooth technology will automatically transmit the information to caregivers which facilitates the tracing