Features: 1.The product is adopted the quality ABS material for shell, good touch feeling, sturdy and durable. 2.With clear LED display screen, easy to read detecting data. 3.The device is used for HCHO and TVOC air quality detecting in home. 4.Portable design, mini compact size with a cord that easy to carry and take in your pocket. 5.Convenient to use. There is a calibration button on the product, marked with Specification: Are you worried about the formaldehyde of your newly decorated home? Do you know the bad air condition in your car that will cause big harm to you health? Do you want a air quality detector meter that can help you analyze the air around your little baby? Our new arrived formaldehyde detector will help you about this. Good product at competitive price! For the health of all you families, don't miss it! Features: The product is adopted the quality ABS material for shell, good touch feeling, sturdy and durable. With clear LED display screen, easy to read detecting data. The device is used for HCHO and TVOC air quality detecting in home. Portable design, mini compact size with a cord that easy to carry and take in your pocket. Convenient to use. There is a calibration button on the product, marked with "M". Powered by 2 pcs AA batteries (Not included). Specifications: Condition: 100% Brand New Usage: Home Use HCHO and TVOC Air Quality Detecting Shell Material: ABS Main Color: White Detecting Range: 0.000-1.999mg/m3 Measurement Accuracy:0.001 Storage Temperature: -20~70 Working Voltage: 2.4-3.0V Power: AA Battery x 2 (not included) Concentration Unit: mg/m3 Collection Method: Diffusion Type Detecting Temperature: -20~70 Size: Approx. 6.3 * 14.2cm / 2.5 * 5.6in Thickness: Approx. 2cm / 0.8in Package Weight: 155g Usage: 1. There will be about 200 seconds warm-up after turning on the device, then press the right button and hold for 5 seconds, release after hearing "Beep......", then start air test. When formaldehyde concentration is no higher than 0.01, the air quality is good. When formaldehyde concentration is over 0.1mg/m3 and TVOC is over 0.6mg/m3, the formaldehyde is overproof, alarm indicating light will turn from green to red, that suggests to open the door for good ventilation. When formaldehyde concentration is more than 0.3mg/m3, the formaldehyde is overprood seriously, buzzer will give an alarm. We suggest to open the window for good ventilation at once, and pay more attention to formaldehyde test constantly. 2. Press on/off switch for 3 seconds for turn on/off the device. 3. We suggest to turn off the device immediately after use to save power. Package List: 1 * Formaldehyde Detector (exclude battery).