Walker's Game Ear GWP-XSEM XCEL 100 Digital Electronic Muff with Voice ClarityWalker's Game Ear GWP XSEM XCEL 100 Digital Electronic Muff with Voice Clarity Advanced digital circuitry; Active dynamic sound suppression; High gain omnidirectional microphones; 4 listening modes: universal, speech clarity mode, high frequency and power boost; Wind noise reduction; Voice mode navigation; Auto shutoff for 2 4 6 hours; Controls on headband; Less holes in muff cups improve NRR; Ergonomic headband design; Rubber bumpers on lower cup;