Do you have the habit of running for exercise? Do you want to run a little further? If you want some music while running, take this pacer. You can clip it on the collar of your clothes. It can play music for you while you are running. If you feel tired and want to stop, or if you want to run a longer distance, it can play some rhythms to encourage you to keep going. Also, it has a GPS positioning system to calculate the average distance of each step. Of course, you don't need to wear headphones; the rhythm can be directly transmitted to your ears. When you reach a goal, the rhythm will gradually speed up to encourage you to achieve the target. For people who do long-distance running training, this pacer is particularly necessary.