2 simplex 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 SC connection and is used in single mode (SMF) connections and applications. Comes as a 2 pack. The attenuators are cost effective and 100% compliant for all of your networking needs. The products are guaranteed by federal law to not affect or void OEM warranties.