The PH-3500 is a 14 oz. passive noise reduction headset which maximizes hearing protection while minimizing weight. Its noise reduction rating of 24dB is designed for use in noisy environments. The PH-3500 features a three-position tension adjustment and a stainless steel strengthened headband for maximum comfort. Comfortable foam-filled ear cushions with volume controls in each ear cup allows the user to adjust the level for each ear. The boom arm features a sealed ball-and-socket joint and flexible boom for precise microphone placement on any head size. The PH-3500 is dual-sided, lightweight and so comfortable you will not believe it can still attenuate noise and protect your hearing.