This is a clip-type air fan that can be clipped to your collar. This is a set of two, but only one neck strap is included. Simply clip it to the collar of your clothes. Experience the refreshing feeling of the wind blowing directly through your clothes. Even if you can't clip it to your clothes, you can use the neck strap to blow air directly into your clothes. The main unit has a thorough antibacterial treatment because it comes into direct contact with the skin. This is an ultra-lightweight model that is also designed for comfort. This one unit will make your outings comfortable even in the middle of summer. Thank you for viewing. ci1010b9