There Certification: When consumers buy "Tiny Cooling Fan", to look at the instructions to see if the mandatory certification of quality system certification, whether there are inspection standards certification; and now promote "green carbon", but also whether the energy efficiency standards at the national level.
Noise: the main components of "Tiny Cooling Fan" making noise is the motor, in the selection of fan must listen whether the noise when the motor is running, see it in operation whether jitter is stable; good motor let you in quiet environment, only to hear the wind, "whispers", ultra-quiet fan blowing air is good.
No odor: odor is the smell of varnish coating "Tiny Cooling Fan" on copper produced during operation, in the purchase of electric fans have smell, see this paint is environmentally friendly, whether through quality testing, so that You enjoy the cool air in the fresh air.