Very small, very practical and micro sencible and quality earphone. I took this hearing amplifier for my father over 80 years and that made us repeat several times. It becomes increasingly dull and I could not talk with him normally. Since this device was: "IT ALL MEAN" is great because more problems to talk. I recommend happens to anyone hard of hearing, it is much cheaper than the hearing aids and you get the same result. THANK YOU THANK YOU THANK YOU for this great and cheap product.