A device and system for measuring vital signs is provided, which includes a housing and an electronic circuit within the housing. The housing has a pressable button on its front side and a sticky surface on its back side for affixing to an object. The electronic circuit measures and recording vital signs data when activated. The electronic circuit may be activated by pressing and holding the button. The vital signs data comprise one or more of: body temperature, heart rate, blood pressure, and blood oxygenation level. The device may include an artificial intelligence unit that stores, records, and analyzes the vital signs data. The artificial intelligence unit builds a worldwide HOT ZONES database and a body temperature map containing information about regions with people reporting elevated body temperature. The device provides proximity alerts to users showing a Safety Circle so users can maintain distance from users with elevated temperatures. The device may be wearable and the housing or enclosure may be in the form of a bracelet, neckless, or ring.