This is a controller for FPS games on smartphones. While the ones from 100-yen shops only have two triggers, this product has four triggers, making it very easy to use. With a smartphone, the number of buttons you can press is limited depending on how you hold it, but using this allows you to easily press several buttons. In addition, it has a fan so you can play while cooling down even if your phone gets hot with heavy games. The fan is rechargeable via Micro-B. It also has a stand function on the back.