Heat Snitch thermal detector 
Heat-Snitch Thermal module for monitoring temperature and sudden heat rise in a room or a container.  
Monitoring trough a mobile app on your phone and send notification if temperature rising or out of set range.
 The price includes the first year Subscription fee. After the first year to renew is $198 yearly. 
Subscription is including 24/7 internet connection via Spark NZ network, Server monitoring and mobile app usage. 
Comes with USB wall adaptor and 1m usb cable for power it up and Lifetime warranty until your subscription is active. 

 It's a great choice to remotely monitor battery containers, laser machines, server rooms, and many more.
HeatSnitch heatsnitch Phone application
Phone application