The MA 10320 is an additional sensor for the Mobile Alerts system. It allows you to monitor temperature and humidity from your smartphone. In conjunction with the gateway and the "Mobile Alerts" app, you have the option to set individual alarm thresholds, which will trigger an immediate alert via push notification on your smartphone if exceeded or not met. Using the existing gateway (not included with the MA 10320) and the installed "Mobile Alerts" app, temperature and humidity data are transmitted directly to your smartphone, enabling you to check the temperature and humidity of, for example, your terrarium at any time. Within the app, you can set alarm thresholds that will notify you on your phone if exceeded or not met. If the temperature or humidity rises or falls too drastically, you will be promptly alerted, allowing you to prevent significant damage. Additionally, the MA 10320 transmitter is compatible with Amazon's Alexa, so you can easily check the temperature and humidity levels at any time through an Echo device.