I bought it, and on the packaging it states "56 DB" audio not 86 DB as stated in product description...big difference, right? Anyway, I dunno how well it works b/c it arrived w/a dead battery. It said on package that it is a "life long battery" and something like 'no need to ever change battery'. I took it as a bad sign and sent back to Amazon. It might work great, but after that, I didn't wanna risk it.