If an elderly person is lost and no contact is made, the caregiver should first remain calm and check the location information of the Bluetooth tracker of the elderly person. The caregiver can retrieve the personalized information that has been prepared and recall the clothing that the elder was wearing when last seen, and then call the police immediately. In addition, the caregiver can also upload the pre-made reminder to social media platforms for assistance. If the elderly person has left the home, check with the management office for any clues about his whereabouts or look for him at the places he frequents. It is recommended to arrange a relative or friend to stay at home so that someone can answer the door when the elder returns home on his/her own.