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Built-in lithium battery, usb can be charged, charge at any time, not afraid of power off, 30 minutes fast charging, full charge available for 4.5 hours or more, built-in 580mah lithium battery, pm2.5 over standard quotation, exceeding alarm value, instrument flashing red data (instrument default alarm Value is 115)

Digital Air Quality Monitor Laser PM2.5 Detector Monitor