For the past few years I have transitioned from print books to audiobooks because of eye issues. I use ear headphones/headsets for a single ear to listen to everything from audiobooks to watching youtube videos, and digital movies. Anything a tablet does for audio. Over the years battery life has gone from a couple of hours to 20 to 24 hours for these Bluetooth type devices. I saw this advertised 48 hours and I was in. It flat out works. I am one that has a Bluetooth in my ear, paired to my tablet and it stays ON constantly. It isn't always streaming something, but at least 70% of the time it is. This lasts for DAYS, no exaggeration. It's the best I have ever used for battery life. Also, the device shows time left as a percentage. Great feature.Another plus is that it consistently pairs upon turning it on. My last ones did not -- what a hassle. As for distance, I get coverage to my entire 1200 sq ft home except in the same spot my last ones sputtered, where I bent down to get socks from my drawer. It works to the street when my tablet is inside. This thing is great. It is 5.3 Bluetooth swhich apparently saves battery life.So why the 4 stars. As for safety it sits over your ear. That's a huge plus. It doesn't have a silicone cover that gets loose with age and causes issues with the placement in the ear (they won't stay in place but point down or the covers stretch out). Wonderful. But, it does make for a lower volume. A deal breaker? No way. As I finish this I am ordering another one.Bottom line, after ordering 22 versions of various brands (yeah, i looked it up), this is my favorite, period. Almost forgot. -- the price point is great. Thanks for your time.