Peltor Sport RangeGuard Electronic Earmuff NRR 21 DB 3.5MM Input Jack Gray. Ideal for range and hunting use. Noise reduction rating (NRR) equal to 21 decibels. Low profile cup design works with shotguns & rifles. Single external battery door. Adjustable padded headband. Durable recessed microphones. Single on/off and volume control. 4 hour auto shut off to preserve battery life. 3.5mm audio input jack for MP3 & 2 way radio compatibility. Runs on 2AAA batteries (not included). Specifications for PELTOR Sport RangeGuard Electronic Earmuff NRR 21 DB 3.5MM Input Jack Gray: Manufacturer: PELTOR Color: Gray Fabric/Material: Plastic Size: Adjustable Battery Type: AAA Additional Features: Electronic Earmuff Age Group: Adults Holster Material: Plastic Handle Color: Gray Blade Material: Plastic Handle Material: Plastic Features of PELTOR Sport RangeGuard Electronic Earmuff NRR 21 DB 3.5MM Input Jack Gray: 3.5MM Audio Jack Package Contents: PELTOR Sport RangeGuard Electronic Earmuff NRR 21 DB 3.5MM Input Jack Gray