This small capsule is magic! and prettier ... Significantly smaller than a tennis ball, it fits easily in a bag or briefcase and makes a real service: it amplifies the sound of the iPhone as the iPad (and surely of other equipment to jack) without changing the sound quality; really, at that price, a real service is rendered. I was disappointed by other products previously considered equivalent, sometimes more expensive and this one really keeps its promises + excellent workmanship. In short, an excellent price / quality ratio, especially in this range! (I'm not paid to do a good review ...)