The MRT7681 from Microwave Factory is a Radar Target Simulator with Bandwidth 1 to 4 GHz, Frequency 76 to 77 GHz / 77 to 81 GHz, Power supply 100 to 240 VAC, Range -1000 to 1000 km/h, Range Resolution 3 Meters / 300 Meters. More details for MRT7681 can be seen below.