Brief: The NB-IoT Temperature and Humidity Logger is a type of hygrothermograph. It features a built-in temperature and humidity sensor or can connect to an external sensor to measure temperature and humidity. The low-power LCD screen NB-IoT Temperature and Humidity Logger is primarily used for monitoring and recording temperature and humidity data of products such as food, pharmaceuticals, and chemicals during storage and transportation. It is widely applied across various stages of warehousing and logistics cold chains, including refrigerated containers, refrigerated trucks, insulated bags, cold storage, laboratories, and heating monitoring.

（1）Power On
In the off state, briefly press the function button for 2 seconds. The NB-IoT X display will show digital information (the NB-IoT blue indicator light starts flashing), indicating that the smart hygrothermograph is powered on and operational.

（2）Power Off
In the on state, press and hold the function button for more than 10 seconds to turn off the NB-IoT/NB-IoT X.

（3）Synchronization
In the on state, briefly press the function button for 2 seconds. After a short delay (approximately 5~15 seconds), the NB-IoT X NB-IoT logo will start flashing (for NB-IoT, the blue indicator light starts flashing), indicating that synchronization of historical data and current status to the server has begun, along with receiving relevant configurations from the server.
（4）Detachment Alarm In the on state, if the anti-detachment button pops open, a "detached" event will be reported to the server; if the anti-detachment button is pressed in the on state, a "fixed" event will be reported to the server.
（5）Indicator Light Description
After the NB-IoT X is powered on, the "NB-IoT" and signal strength icons above the hygrothermograph screen will display the status of the NB module searching for network, invalid network connection, network signal strength, communication in progress, invalid SIM card, or module abnormality. The display area shows according to the "network signal strength" method described below; NB is not lit; 

Other Indicators:

Upload Cycle: Data collection and upload cycles can be remotely set and modified (fastest 5 minutes), with a maximum upload cycle of 24h or longer; Historical Value Upload: Data is collected every 5 seconds. If the data change exceeds the set threshold (default ±0.5℃), a point is recorded, with a cumulative capacity of 512 points. If the storage space for 512 points is full, an automatic report is triggered; otherwise, each communication time window will report once, uploading all historical values since the last report and clearing the historical record storage space; Low Power Consumption: The device distinguishes between heating and non-heating periods, with configurable cycle ranges; two cycles employ different reporting logics to enhance device lifespan and reduce power consumption.

Data Security: Device data transmission should be encrypted using mainstream encryption algorithms;

Case Application: