Get Howard Leight ones if on a budget, they are pretty good for range use or opt for the MSR Sordin (pricey) which the audio qualities of the MSR are excellent.
With the Sordin - while in the house I can hear light footsteps and which direction its coming from very easily, can also pick up water dripping from the bathroom faucet that would be too faint to hear without, I laugh when I hear guys yelling very loud cause they can barely hear each other at the range but everyone with electronic muffs can hear every word. Especially funny when they're speaking of your gun and think you cannot hear them. LOL!
Aside from the fun benefits, both muffs do a great job blocking out the harmful decibels from the firearm's report.
Pictured below the Colt LE6920 is a MSA Sordin Supreme X:
<<<I don't advocate botach but just providing a link to the product.
Avoid the electronic muffs that have individual volume controls for the left and right sides. That will get very annoying at the range. Also - especially if indoors double up on your ears with foam in the ears then muffs over. Its your hearing, once its gone its gone.