Features: Digital formaldehyde(HCHO) monitor with temperature humidity display, accurate test of air quality. Measurement range: 0mg/m³-1.999mg/m³, operating temperature: -10℃-50℃, working humidity: 20%-90%. Rechargeable lithium battery, low power consumption and long for time service. High-performance electrochemical sensor equipped with a new circuit chip, acquiring formaldehyde concentration of real environment. Suitable for new house, home, office, etc. Specifications: Material: Plastic Size：8.3x8.1x5.3cm/3.27x3.19x2.09 in Measurement method: semiconductor detection Measurement range: 0mg/m³-1.999mg/m³ Operating temperature: -10℃-50℃ Working humidity: 20%-90% Battery: 1500 mah Input power: for DC 5V 1A Package Includes: 1X Formaldehyde Monitor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.