The Radians CSE10BX Tactical Electronic Earmuff amplifes low level sounds while protecting against harmful noise. Excellent hearing protection for all hunters and shooters. Listen to your favorite smartphone or MP3 device with the added input jack. Compact folding feature allows for easy storage. Premium electronic earmuff. Dual microphones for optimal sound reception. Input jack with patch cable included for use with MP3 or smartphone devices. Adjustable headband. Compact folding feature for storage. NRR 23dB