Features:  Advanced technology of Laser Sensor Detection, detect PM2.5 in Air and transform into digital display accurately, show different healthy level warning in different color. Excellent for daily air quality monitoring.  Detect PM2.5 by laser scanning, giving results more stable and accurate than infrared sensor detection.  Rechargeable built-in battery with 1200mAh high-capacity, support 4-6 hours continuous running.  Mini size only 76*76*46mm, easy to carry and can be put on anywhere you need.  Applicable for many occasions, office, home, garden, in-car, etc. Keep track of the air quality around you.     Specification:  Material: Acrylic+ABS plastic;  Size: 76*76*46mm/3.0*3.0*1.8inch;  Weight: approx.100g;  Color: Black;  Battery: 1200mAH lithium battery;  Working voltage: 3.7V;  Input: 5V/1A;  Battery life: 4-6 hours;  Display screen: OLED screen;  Working temperature: -20-50℃;  Feature: Small and exquisite/Durable battery.     Package included:  1 x Air Quality Monitor;  1 x User Manual;  1 x Clean Cloth.