The xcel 100 allows the wearer to select between four different listening modes: universal, speech clarity, high frequency, and power boost.The sound-activated compression and variable dynamic sound suppression automatically adjusts compression time according to noise level intensity and duration instead of using conventional "fixed-time" compression.The xcel 100 also comes with programmable auto shut-off, so forgetting to turn the muffs off and accidentally running down batteries is a thing of the past.Type: Electronic EarmuffColor: Gray Ear Cups w/Black BandNrr: 26 dBQuantity: 1 PairStyle: Over the HeadBattery: AAA