It's a bit lengthy, but it's worth reading at least the 1st paragraph about the unreal battery life ?... And, of course, don't miss the last comment as suggested by Ben Stiller's character's catchphrase from Starsky & Hutch.I have been using this M5 Sonic electric toothbrush since I purchased it through Amazon last year in October 2023. The battery life is unbelievably long! Amazing, really. The battery would likely last 120 days as the description indicates, but only if you're brushing 3 times a day based on my calculations (calculator confirmed)! IMO, and don't just take my word for it, but 3 times is a bit much for 1 day: from a Google search and my dentist's mouth... The American Dental Association (ADA) recommends brushing your teeth at least twice a day for two minutes. Anyway, I brush and floss on average once a day at night (TMI?). Don't tell my dentist. The battery just ran out for only the 2nd time in approximately 1 year. It died around mid-December 2023, about 2 months after I purchased it. But that was using what little charge it came with. Now, in December 2024, weeks before Christmas, I am charging it once more. If my memory serves me right, I literally never plugged it in since about this time last year for the 1st full charge. Just a single charge in a year brushing once a day. I'm more than impressed by the battery life of this toothbrush, which was 365 days for me on a single charge, give or take a couple of days.Naturally, it does the job well, as it should, just like most electric toothbrushes. There are 5 settings, but I use the top one (fastest of the 2 top settings) about 99% of the time. Comes with a handy traveling case with spots for the toothbrush, one head, a spot for the charging cord/2nd head. There are 8 total brush heads, which vary in color based on their hardness/softeness, I believe. Getting the charging cord to fit in its designated spot in the travel case? Not easy, but you can do it with a little effort. But you'll never need to take the charging cord with you anyway as long as you charged it sometime within the last 6 - 11 months (depending on how often you brush).If you've been searching around the vast depths of the internet for the perfect (or very-nearly-perfect) toothbrush for your oral hygiene, then stop what you're doing right now (unless your brushing) and add this handy, nearly-limitless-battery-life magical tooth-cleaning device to your cart and checkout without hesitation. Within a day or 2, you'll be brushing non-stop for up to a year on a single charge!Only negative that I can find is if you accidentally press one of the other 5 of 6 brush modes (off mode included) during brushing, you then have to either press and cycle through the rest of the modes to get back to the one you were just using or you have to long-press the mode you want. It's not a big deal. It's just a little too easy to change modes. Changing modes easily and quickly could be a good thing for some people. For me, though, accidently selecting another mode happens maybe once every other month or so while I'm brushing.It's lightweight and not very loud at all. Although my wife usually disagrees with my opinion of the sound level. She can somehow hear it through our bathroom door. But yeah, I still have 100% of my hearing, and it is not at all loud for me.Finally, and if you made it this far (or if you just skipped to the bottom), do as Ben Stiller said multiple times within a minute in Starsky & Hutch (20 years ago?!), "Do it. Do it." If you just happened to miss my suggestion with my poor attempt at some humor here using just 2 to 4 words to summarize everything you may or may not have just read: Do it. Buy this. Good luck, and we're all counting on you.