I thought this video/message needs to be heard.  It is not graphic, but it is very gut wrenching to listen to.  Be safe.  Danl 

 

I recently scared myself by discovering I had left the table saw running without realizing it. My son bought me a set of Bose noise canceling headphones to use in the shop. It Bluetooth connects to my iPhone and allows me to listen to whatever and even answer the phone without touching the phone in my pocket. It has three levels of noise cancelation. The problem arises when it’s on the highest level of noise cancelation. You can’t hear the tool running. Very dangerous. There is also an audible aspect to woodworking that is necessary. One needs to hear the load on the machine or the pitch of the cutter head etc to safely use the tools. I have learned to use the headphones at a medium level which gives me the noise reduction I need but allows me to hear the tools. 
Paul

1 hour ago, Masonsailor said:

I recently scared myself by discovering I had left the table saw running without realizing it. My son bought me a set of Bose noise canceling headphones to use in the shop. It Bluetooth connects to my iPhone and allows me to listen to whatever and even answer the phone without touching the phone in my pocket. It has three levels of noise cancelation. The problem arises when it’s on the highest level of noise cancelation. You can’t hear the tool running. Very dangerous. There is also an audible aspect to woodworking that is necessary. One needs to hear the load on the machine or the pitch of the cutter head etc to safely use the tools. I have learned to use the headphones at a medium level which gives me the noise reduction I need but allows me to hear the tools. 
Paul

You could put up a small red light that you can see as well.  Just tie it into the motor circuit.  I use this for my shop DC.  Works well.  

I won't use the hearing protection unless it's the planer, shaper or my chainsaws.

I need to hear the machine and the wood. Has saved my arse a few times hearing something not right BEFORE it explodes on me.

I don't ear plugs or, muffs, at all. Never have. Huh...whadja say??