Feature: 1. High Accuracy: The self developed NDIR sensor and laser particle sensor are used at the same time, the independent CO2 NDIR sensor has higher accuracy and more strong anti interference than the semiconductor sensor. 2. Brightness Adjustment: Automatic brightness adjustment, according to the surrounding brightness, automatically adjust the screen display brightness to make the screen visible and not dazzling. 3. Auto Screen Off: When no one is using it, the screen can be automatically turned off to reduce energy consumption. When the screen is off, the sensor can still transmit data to the cloud through WIFI. 4. Cloud Link: Tracking at any time, intelligent analysis refreshing display, built in WIFI, use mobile phone APP to query data at any time, remind family members to purify the air. 5. Multifunctional: This air quality meter can detect carbon dioxide, PM2.5, HCHO, TVOC, temperature and humidity, with various functions. Specification: Item Type: Smart Air Quality Monitor Material: ABS Gross Weight: 185g / 6.5oz Voltage: 5V Current: 2A CO2 Detection Range: 400-5000PPM CO2 Detection Accuracy: ± (50OOM 5% reading value) Temperature Detection Range: 0-50℃ Temperature Detection Accuracy: ± 1℃ Humidity Detection Range: 0-99% RH Humidity Detection Accuracy: ± 5% RH Battery: polymer lithium battery 1200mAh (included). Package List: 1 x Tester2 x Instruction1 x Power Cord