The RTL-4-3002 from Radar Technology is a DLVA with Frequency 29 to 31 MHz, Dynamic Range 80 dB, Input Power -80 to 0 dBm, Supply Voltage 15 VDC, Operating Temperature -30 to 71 Degree C. Tags: Module with Connector, DLVA. More details for RTL-4-3002 can be seen below.