... wind 3.Energy-saving 4.Environmental protection 5.Air quality tester 1.electric table fan, SAFETY2.Low noise,soft wind 3 ... .Energy-saving4.Environmental protection5.Air quality tester The Air Fan, no blade fan, works differently from convensional ... 200mm: ≥ 4× 106 PCS/cm³ 6. Electronical nose: Air quality tester can show 3 colors lighter: Red-bad, yellow-fine, green ...