The functionality of this unit ius just fine. The sound and picture are clear and consistent. But, I bought this specifically because of the advertised long battery life of 10-11 hours. It barely covers 5-6 hours. I am on dialysis and sit in 3 1/2 hour sessions. I wanted nthis to hold a battery charge for 2 complete sessions. It does not and I have to take it home and recharge it when I'd rather leave it in the trunk of my car after one session, leave it there until and through the next one. I can't. Very disappointed with that aspect.