You get two ears… don’t wear ’em out.
My dad gave me a lot in life… most of it resides between my ears. I can replace a toilet. Install a ceiling fan. Put in a 240v sub-panel to power a swimming pool. Build a new kitchen, one cabinet at a time, and install all new appliances. I even know how to hang and texture dry wall (no matter that I refuse to do it). When the drain to the shower you’re remodeling breaks off underneath your foundation, the only thing to do is rent a jack-hammer and break out the concrete so you can replace it.
If you’re going to use a table saw, a jack hammer, a router, or a chain saw, you need to protect your ears. This is the best tool I’ve ever used to that purpose.
The Ryobi active hearing protection system uses a 4v rechargeable battery to cancel the sound waves that get past the noise-deadening insulation. On top of that, it has a port where you can plug in an MP3 player.
There are four microphones on these – two on each year. Beyond detecting sound waves for active cancellation, they are used to allow noise in – when you want it. Turn off the jack hammer, twist a knob, and you can hear the conversations taking place around you. Turn the knob back, fire up the chain saw, and you’re good to go.
I love these things. If you’re a do-it-your-selfer, I highly recommend them. Find them at the Home Depot…