This is a Pair of lights.  

Also please check the dimensions before purchasing, the new lights are smaller than the older versions. Deminsions: 2.5"L X 2 1/8"W 1" Tall 

Model: NV1012SS-1 Replaces the 3500 Series which are no longer available. They are smaller than the previous version.

 LIGHTARMOR Red/Green 2NM LED Stainless Steel Navigation Lights 

INTRODUCING LIGHTARMOR NAVIGATION LIGHTS, a new line of streamlined deck mount lights that meet today's global regulatory requirements, including EN/ISO 19009:2015.* LED Light Engine Cool to the touch Long lasting - 50,000+ hours Color indicated cores for ease of installation Be Safe, Be Seen Sharper cut-off angles and vibrant starboard and port colors for better visibility 2 NM U.S.C.G. Certified Corrosion Resistant Water-Resistant (IP Rating 67) Features tell-tale indicators for ease of use Smaller footprint with refined styling The lowest power draw on the market today! Designed to resist corrosion in even the most extreme saltwater environments Lights are completely sealed and watertight LED technology keeps lights cool to the touch Rated for 50,000+ hours of use Built-in "Tell Tale" indicators Attwood presents the most energy efficient LED navigational lights in the world. Through the use of proprietary optical design techniques, we've optimized our lens design to harness nearly 90% of all light being generated by the LED. In doing so, our line of navigational lights exceed US Coast Guard requirements with the fewest and lowest watt LEDs of any navigational light manufactured today. Less energy used by navigational lighting means more energy available for powering your boat and enjoying time on the water.Engineered to Last As the emerging leader in marine lighting design, Attwood understands the demands of the marine environment. Completely sealed LED units resist water intrusion, electrostatic discharge (during assembly) vibration and ultraviolet light (UV) radiation. Reverse polarity protection has been added to eliminate potential mis-wiring damage during installation. Our LED navigational lighting also features high quality electro-polished stainless steel covers designed to resist corrosion in even the most extreme saltwater environments.The result? Style and durability. Most importantly, Attwood lights are built to stand the test of time. Rated for 50,000+ hours of use and protected by a 10-year warranty, you can count on Attwood products to light your way for years to come.