Wireless ambient light/motion (light-based)/temperature/humidity sensor tag with internal memory for off-line logging. Requires an Ethernet Tag Manager 

Provides fast too bright/dark/hot/cold/humid/dry notifications independent of recording interval. 

Contains local memory for approximately 5460 light+temperature+humidity data points. With the local memory, light+temperature+humidity recording will keep running during a trip, power or Internet outage of up to 19 days at 5-minute logging interval. Put inside vehicles or in your backpacks to capture temperature, humidity and light exposure throughout the trip. Automatically uploads captured data to cloud when back in range and builds seamless graphs. 

Features:

• Ambient light logging and notification with 16-bit digital log-scale light sensor with 0.1 ~ 200,000 lux range. Daily Light Integral (mol/m²/day) calculated by app.
• Temperature logging and notification with 0.02°C resolution temperature sensor (+/-0.4°C error) from TE France
• Enhanced light and temperature monitoring while in range (Learn more)
• Air humidity logging and notification with 0.12% resolution RH sensor (+/-1% error)
• Logging interval programmable from 15 seconds to 4 hours
• Detects sudden change of lighting (as motion event) caused by opening/closing doors or picking up the tag 
• 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.