A Poseidon 4002 unit with various sensors and probes (temperature, humidity, door contacts, power supply, water flood) monitors the environment inside a 19" cabinet. It can report over SNMP to any datacenter or IT monitoring system.
Two different people can be alerted by SMS (text message) to an electricity outage or phase loss
You immediately know when someone opens the cabinet (SNMP Trap, pop-up window)
E-mail alerts you in time to rising temperature
You can check the cabinet status remotely over the Web
You can remotely restart a server or switch on air conditioning