With most electronic earplugs, you will find that they have a noise reduction rating (NRR) between 20 and 30 decibels. The lower end of that spectrum is best suited for shooting because it lets enough sound through to keep you aware of your surroundings while protecting your hearing from sudden loud noises. If you are using earbuds or headphones, look for an NRR above 30 decibels because they will still be able to offer some protection without completely blocking out all sound.