Requires an Ethernet Tag Manager . 

Designed for logging temperature and humidity data with high accuracy and providing fast too hot/cold/humid/dry notifications independent of logging interval.

Features:

• Motion/door open-close logging and notification with angle based motion sensor (not available in "no-motion version")
• Temperature logging and notification with 0.02°C resolution temperature sensor (+/-0.4°C error) from TE France
• Air humidity logging and notification with 0.12% resolution RH sensor (+/-1% error)
• Logging interval programmable from 30 seconds to 4 hours. The "transmit multiple data points at a time" mode improves battery life and allows shorter logging interval 
• Long wireless range allows placing inside most refrigerator/freezer to monitor temperature, humidity inside & door
• Beep to help find missing items
• Out-of-range/back-in-range notification
• Unlimited storage of logged temperature, humidity and motion event data on cloud (can be deleted any time)
• Feature comparison matrix

Battery: Installed, CR2032 x 1 (replacement instructions, where to buy)
Supports PC/Mac through a web browser, app push notification: iOS 9.0 and above, Android 5 and above. Works with Amazon Alexa and Google Home.