The Pro Ears Silver 22 amplifies sound 5x and protects your hearing to a safe 82 db. The super sensitive stereo michrophones are strategically located for incredible 360 degree situation awareness. They feature Gel Ear Seals with proprietary design for extra comfort and extended wear in hot and cold climates. The slim, low profile cups have a leather cut out to protect stocks and ensure a quiet shoulder mount. The single roller power controls are easy to use, even with gloves on. The Noise Reduction Rating is 22 and it comes with a three year warranty. The Pro Ears Silver 22 uses Two AAA batteries which are sold separately.