3) Sometimes I even put them back in in the morning if the house is noisy and I want to sleep longer. Now I have a new pouch and I have one of these receivers attached to it and one to the pouch that has my meter. Cleaning the outside had no effect. I use a sound level of 16 (on a scale of 0-100) in normal circumstances so a hearing impaired person can hear the sound properly. Overall, these are a bargain at this price and even higher - they really sound good, pair easily and fit well. I cant comment yet on battery life as Ive not yet used them for that long. My biggest disappointment is the back. She only used for about a week when the static was on her end and now she doesnt use at all. Primero es fácil de usar, se carga rapido y la autonomía de la batería es demasiado buena dura muchísimas horas mas de un dia, sin problemas al conectarse, ya lo he conectado a celulares, laptops variad y nunca ha fallado. Whoever shipped them gave me a size larger, which I appreciated because it fits perfectly.