M330 NB-IOT temperature and humidity recorder is a high-precision temperature and humidity detection device using NB-IOT wireless networking.  
-The product design is beautiful, strong and reliable, and compact.  
-The equipment has the performance characteristics of low power consumption, strong signal penetration, long communication distance, strong anti-interference ability and convenient networking.  
-The temperature and humidity sensor is imported from abroad, and its appearance is overmolded, which can reduce the influence of external factors such as aging, vibration, and volatile chemical gases on the sensor, ensure its good stability, and meet the national GSP/GMP certification requirements.
-Product features-Built-in imported high-precision temperature and humidity sensor, high measurement accuracy.  
-NB-IOT narrowband Internet of Things communication technology, strong signal penetration, suitable for working in a complex environment with poor communication signals.
-Built-in rechargeable battery, 6-24 months battery life design.
-Double data insurance mechanism to ensure no data loss.
-Multiple EMC testing and industrial-grade components selection.
-Prohibit shutdown function can be set to prevent human operation error
-One-button operation, instant use.
-Support access to light and vibration sensors.
-IP66 waterproof design to meet most work scenarios.
-OLED screen display, compact and beautiful (2/3 the size of cigarette case).

Application Scenarios Refrigerators, refrigerators, cold storages, shaded warehouses, laboratories, buildings, collections, greenhouses, livestock breeding bases technical.
-parameters temperature measurement accuracy: ±0.5℃(-10～+45℃) ±1℃(45～+70  ℃) ±2℃(-40～-10℃) 
-Temperature measurement range: -20～+60℃ (built-in probe), -40～+70℃ (external) 
-Humidity measurement accuracy: ±5%RH (20%～  80%RH) ±8%RH (other ranges) 
-Humidity measurement range: 1～99%RH 
-Resolution: 0.1 
-Positioning method: LBS base station positioning 
-Network standard: NB-IOT 
-SIM card: Built-in (installed before delivery) 
-Upload interval: 1  Minutes to 1440 minutes, factory configuration or platform software issue instructions to modify the over-standard alarm prompt: 0 LED screen 
-Device operating mode: standard mode, shutdown mode prohibited 
-Device software upgrade: local USB interface upgrade, platform remote upgrade 
-Power supply: 2000mAh (M330)  , 4000mAh (M330-XL), 3.7V rechargeable lithium battery 
-Power adapter: 5V/1A, 
-Micro USB interface Charging time: about 8 hours 
-Battery life: see the product selection list description, 6-12 months according to the model,  Up to 2 years.
-Equipment storage environment temperature: -20～+60℃
-humidity: 0～99%RH, 
-Non-condensing Waterproof grade: IP66 
-Drop grade: Reference standard: GB/T 2423.8-1995 
-Host shell: ABS 
-Weight:  About 150g (M330), 220g (M330-XL) 
-Host size: 753*85*21MM (M330), 753*85*21MM (M330-XL) 
-Platform monitoring software: cloud platform