This device is really quite good, especially for the price! My wife's hearing aids cost us almost 6K for the pair, and I doubt they are much better than this 10 buck device is. It uses the latest noise cancelling digital technology. I am using it right now watching the TV. It seems to work quite well. Maybe I will be able to hear my wife better lol. At least that's what she hopes. Seriously, it works very well in the house. I hope it will work as well when we go out.
It comes with spare earpieces and batteries. It uses standard LR44 batteries, available everywhere.