Timing is set up to 1000 hours, automatic end stop oscillation and the sound and light alarm; brushless DC motor design, wide range of speed regulation, constant torque, constant speed, no carbon brush, maintenance free, completely solve the low swing speed instability problems; machine adopts imported bearing, long service life, the noise is low; using adjustable new outlet, can conveniently adjust the amount of fresh air; unique defrosting, defrosting temperature fluctuations small;