brand new and high quality Features: High precision, accurate detection and good stability provided by quad-core processor. Color partitioning is for displaying all testing information clearly. Dustproof and anti-fog in use of acrylic mirror. Easy to carry and handle. PM-2.5 Detector only, other accessories demo in the picture is not included. Specification: Type: PM-2.5 Detector Color: Black Testing Items: Formaldehyde, TVOC, PM-2.5, PM10, Air-Quality Displaying Mode: H D Color LCD Display Test Principle: Electrochemical Semiconductor + La-ser Sensing Input Specification: 5V/1A Power Supply: Polymer Lithium Battery It lasts 4-5 hours on a full charge Battery Capacity: 2600mAh Alarm Mode: Buzzer Alarm Power Connector: Micro USB connection charging Alarm Valve: Adjustable Size: 152 x 68 x 42mm(5.98 x 2.68 x 1.65inch) Quantity: 1 Pc Testing Application: 1. Detection of Formaldehyde. 2. Detection of TVOC and Benzene 3. Air-Quality Rating 4. PM-2.5 Monitoring 5. PM10 Monitoring 6. Intelligent-Alarm System 7. Air Monitoring Real-Time Recording 8. 24-hour Air Monitoring Note: 1. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x PM-2.5 Detector