Hello everyone ! This is Helen of Topsharp , I'm at our laboratory now .From these equipments , you can find that we're a professional factory . You may also find this fan on my neck, it our air condition neck fan HF375 ,with semi-conductor cooling technology , this semi-conductor part can cool down in 1 minute . Different people can use it , since it's adjustable, like this . With the hands free fan , we can do other thing with enjoying cooling wind , so perfect !