The Uniden DFR3 detects radar weapons emissions and sounds an audio warning for the driver. The detector determines which band interval comes from the signal and shows that frequency on the screen (X, K, KA, or L). Frequency resistance (1 to 5) is also shown as appropriate. If there is a specific warning code, it is also displayed. The DFR3 uses two different modes for the use of motorways or cities.