Specifications: Material: ABS + electronic components Size: about 120*63*26mm/4.72*2.48*1.02in Weight: about 280g Application technology: Natural airflow detection technology Display Mode: LED Power Supply: power supply (equiped with 1 about 1.2m/47.24in USB charging cable) Power-On Warm-Up: about 120 seconds Working Voltage: 5V Battery Capacity: 850mAh Charging Time: about 3 hours Approximate Working Time: about 180-240 minutes Product features 1.5-In-1 Air Quality Monitor: Suitable for testing carbon dioxide, harmful materials, carbon monoxide and so on. Provide you 24-hour real-time detection for your family health. 2.LED Color Screen Display: With clear numbers, it is effective on eye protection. Intuitive reading, clearer display, easy to identify and read. 3.Built-In Lithium Battery: Equipped with 850mA rechargeable battery, charging time is about 3 hours, working time is about 180-240 minutes. 4.Intelligent Air Quality Detector: It has the smart chip for more accurate detection, with independent sensor, suitable for various detection objects, to ensure more accurate detection of the instrument to help users understand the environment. 5.Portable and Lightweight: Lightweight design and small in size, it is easy to carry and can be used directly by plugging in the USB cable. It can be placed anywhere: schools, offices, bars and restaurants, homes, cars.