The main alert that is monitored by a lone worker device is a panic alarm, or a duress alarm. This type of alert is used in an emergency situation.
Some lone worker alarm systems, such as SHEQSY by SafetyCulture, also require employees to complete automated check-ins and send overtime alerts if they fail to do so. When employees are unresponsive for a certain time period, overtime alerts can turn into panic alerts.
Some lone worker devices also include man-down/fall-detection panic alerts, which can be triggered automatically, via wearable Bluetooth devices.