1It is suitable for offices, homes, gardens, cars and other places to understand the surrounding air quality. 2Built-in li-ion battery USB charging, long-lasting battery life without fear of power off. 3Laser scanning to detect PM2.5 formaldehyde is more stable and accurate than infrared sensor results. 4Advanced laser sensor detection technology converts its data into different colors to remind people. 5The TFT display design is clearer and more convenient, making it easy to read.Condition: 100% Brand New Item Type: Formaldehyde Detector Material: ABS Color: As Pictures Shown Battery Type: Built-in li-ion battery USB rechargeableCharging Time: 60 minutes Working Voltage: 3DC5V Battery Capacity: 2500mAh Test Temperature: -20-40Test Humidity: 20-90% RH Response Time:1 x Host1 x USB Cable1 x Manual1 x Certificate1. Do not use it flat or hand-held to avoid blocking the back vents.2. Please avoid perfumes, toilet water, oil fume, acid fruits and other interfering gases.