Feature: Unique design, easy to use. High detection accuracy, effective detection of methanol (HCHO) and harmful gases (TVOC) in the air. Large-screen LCD display with dual-color backlight. All operations can be performed with one button. It can be used in offices, bedrooms, cars and other occasions. note: It is recommended to avoid chemicals such as alcohol, fragrances, perfumes, cigarettes, air fresheners, etc., to avoid damage to measurement accuracy. Please do not block the measurement port or blow into the measurement port. During testing, if you do not use any buttons for 60 minutes, it will enter the standby state. If you need to cancel the automatic standby function, pre and hold the button for 3 seconds to turn on the phone, and then the word 3 will appear on the screen. After releasing the button, short pre the button again, the number 1 will be displayed on the screen, and it will exit the automatic standby state after 3 seconds. This product is not waterproof, please avoid getting wet. Specification: Color: Black Material: Plastic Detection range: 0.000-3.888mg/m (methanol), 0.000-9.999mg/m (TVOC) Need batteries: 2XAA batteries (batteries are not included in the package) Size:5.3x11.2x2.1cm Quantity: 1pc Note: And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package)