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Suppresses gunshot noise while amplifying low-level sounds. Designed for indoor or outdoor use. Adaptive Frequency Response reduces background noise for clearer conversations and hearing of commands. Variable Suppression Time feature provides optimal echo reduction in indoor shooting environments. Low profile cups. Two hour auto shut-off. Easy access battery door with tether. Operates on two AA batteries. 3.5mm audio jack compatible with most MP3 players and 2-way radios.