Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Features 1. High Accurate Sensors: Uses high-precise NDIR infrared carbon dioxide sensor, laser particle sensor, semiconductor sensor, optical sensor and distance sensor, with high sensitivity, superior interference resistance ability, stable working performance, with low power consumption. 2. Sleep & Approach : The screen can be automatically turned off to reduce energy consumption after no operation, and the sensor can still transmit data to the cloud through WIFI when the screen is off, and you can view the real-time values through the APP. 3. Parameters Setting: Support to set the PM2.5 & CO2 alarm value, alarm sound, temperature unit switching, screen off function switching and screen off time setting in the settings page. 4. Air Quality Level Indication Function: It will change the signal color according to the air quality index, and allowing you to more accurately and more graphic know the current air conditions. Specifications Battery: 1 * 350mAh lithium battery (included) Display: LCD color display Sensor: NDIR infrared carbon dioxide sensor, laser particle sensor, semiconductor sensor, optical sensor and distance sensor HCHO measurement ranges: 0-1.999mg/m³ TVOC measurement ranges: 0-9.999mg/m³ PM1.0/PM2.5/PM10 measurement ranges: 0-1000μg/m³;±10μg/m³(0-100μg/m³)or ±10%(100-500μg/m³) CO2 measurement ranges: 400-5000PPM; ±(50 + 5% reading)PPM Temperature measurement ranges: 0-50℃; ±1℃ Humidity measurement ranges: 0-99%RH; ±5%RH Recharging : USB Type-C interface, 5V 2A Material: plastic colour: white+black Package Contents: 1 x Air Quality Monitor 1 x Type-C Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.