It has one, I have a Tread and it's referred to as the "key" and has the same type of clip. Kids of course don't know to use an emergency stop which is why I'm

It has one, I have a Tread and it's referred to as the "key" and has the same type of clip. Kids of course don't know to use an emergency stop which is why I'm going on and on about maybe not being negligent parents and leaving kids near a piece of power equipment that causes 20k+ injuries a year... But apparently that's a radical take for HN