Given the task definition and input, reply with output. In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

The Jaybird Runs are well made and fit perfectly in ear. Once it's in, it will not fall out, even during workouts and vigorous activity. The music seal is good and allows for good bass sounds. The equalizer will make this earphone apt for the majority of listeners, although for more discretionary listeners, it may be a little muddled between the mids and highs. Functionally, the case works well in charging the earbuds. Battery life feels a tad shorter than advertised. The earbuds pair as soon as you take it out of the case. The downfall is that the on earphone controls give you the option of being volume controls OR a pause play button. But not both. The big NO NO for me with these earbuds is that the bluetooth pairs with the right ear and from the right ear to the left, there is a delay in sound, which isn't too noticeable when just listening to music or taking phone calls, but is impossible to ignore when watching a video or making a video call. The sync is off by half a second and it makes videos nearly unwatchable. For me, while I mainly use these buds for music during workouts, I do make video calls and watch an occasional video and even these short stints become disturbing when the sound sync is off. If I didn't live overseas, i'd return these ASAP but I guess i'll just have to live with these.
Great for working out, good for music, horrible for video