The Model MD500L IFF Transponder is an L-Band augmentation device ideally suited for use in aerial target drones, unmanned vehicles, and cruise missiles as a radar enhancement device that provides automatic radar identification in response to interrogations from L-Band IFF and Air Traffic Control (ATC) radars. It also supports Mode C (altitude reporting) operation.

It features a modern, compact design with less than 90 cubic inches (1475 cubic centimeters) in volume and weighs 4.25 pounds (1.9 kilograms), which is 35% smaller than previous versions. The transponder incorporates the latest in solid state electronics design and features a 500 watts nominal peak power output. It also features IFF/TACAN blanking and suppression, reverse polarity power lead protection, and a built in duplexer for single antenna operation. Also, the transponder was designed with both front panel and remote reply code selection for greater convenience and ease of use. The L-Band IFF meets the requirements of MIL-STD-810 and is designed to operate over the temperature range of -54° C to +71°C.