Not too big, but very sturdy. The battery life is great on mine. Dicho esto paso a describir el producto:Importante lo primero que tienes que tener en cuenta es que las conexiones vienen protegidas con una funda de silicona, hay que quitarla antes de conectarla a los aparatos e introducir hasta escuchar el click, cuando lo haces se enciende el cable. Have been using for nearly a year, still holding up nice, will notethat I dropped it on the floor once and the scroll wheel is nowpretty intermittent, sometimes going up when I scroll down,or vice-versa, but hey, I dropped it on the floor so. Id like to see a slightly more expensive "industrial grade" EARBUDi option. Great price and seem durable. love it ???? While they work great, the comfort is horrible. These are SOOOO DANG COMFORTABLE and a soft inner foot liner too WOW, a spongy comfortable but stable middle soul than the bottom has grips you cant slide PERFECT FOR ALL AGES. My son, 8y old, said the other night "wow now this is real soap".