The project aims to solve the shortage of current emergency calls through mobile devices. The stretchable wristband is designed to enhance the efficiency of responding to the emergency. GPS location is included in the feedback of scanning the matched BLE advertising packets. The sender will broadcast the BLE signal only if the embedded circuit of the wristband is triggered. Currently, the research team is mainly focused on the flexible materials for the wristband and the accessibility of powering the wearable device through energy transformation. It would be a sustainable wearable way to upgrade personal security.