Dyson Cool CF1 Adjustable Bladeless Portable Desk Fan amplifies airflow to cool you. Patented Air Mulitplier technology amplifies the surrounding air, providing an uninterrupted stream of smooth airflow with powerful cooling.​ Effective cooling all year round.​ Now connected with MyDyson app control.¹ Acoustically engineered to be quiet, even at full power. Whisper-quiet at 29dB in Sleep mode, plus a dimmed display. No blades. No choppy air. Recommended for upto 250 sq ft for opimal personal cooling.