The Sentinel uses cloud technology to provide supervised 24/7 remote monitoring of environmental conditions and unattended equipment at commercial greenhouses. It enables operators to access real-time status conditions, change settings, disable alarms, and readjust temperature limits via any device using the Sensaphone iPhone/Android app or at Sensaphone.net. The Sentinel records data points such as temperature, humidity, and CO₂ that can help operators identify trends in environmental conditions that indicate possible equipment problems.