These are IoT devices used to monitor states. For example if open / close / on / off.
When used with ..:::Sethala:::.. (our IoT Cloud Application) you are provided with a full IoT monitoring and management cloud based application with various dashboards to manage and monitor your assets. Multiple thresholds to be tracked can be configured and related contacts will receive email/sms/push notifications and reports.
Please study the requirements of these devices carefully, some of them might require a gateway and/or a subscription service.