2 fiber optic attenuators used in fiber optic links to reduce or attenuate optical power. This fixed value attenuator will reduce optical power by 10dB. It uses a male to female ST connection and is used in multi mode (MMF) connections and applications. Comes as a 2 pack. Our attenuators are cost effective and 100% compliant for all of your networking needs. Our products are guaranteed by federal law to not affect or void OEM warranties.