Life-Link is a bracelet like intellectualized monitor system for senior people. The system contains backstage cloud service, a clip-like Bluetooth device and a bracelet. Life-Link can keep track of the location and heart condition of senior people and can send an alerting signal. Once the seniors are falling down, the device will send a SOS signal to the backstage. Life-Link can also be used to make a phone call with the guardians. Life-Link integrated the hardware development, cloud service and backstage monitoring and it provides a reliable service guarantee.