diff --git a/src/main/java/object/fredainsworth/Radio.java b/src/main/java/object/fredainsworth/Radio.java
new file mode 100644
index 0000000..c598fde
--- /dev/null
+++ b/src/main/java/object/fredainsworth/Radio.java
@@ -0,0 +1,75 @@
+package object.fredainsworth;
+
+public class Radio {
+    private int serialNum;
+    private double frequency;
+    private String activationPhrase;
+    private boolean poweredOn;
+    private boolean isListening;
+
+    public Radio(int serialNum, double frequency, String activationPhrase, boolean poweredOn, boolean isListening) {
+        this.serialNum = serialNum;
+        this.frequency = frequency;
+        this.activationPhrase = activationPhrase;
+        this.poweredOn = poweredOn;
+        this.isListening = isListening;
+    }
+
+    public int getSerialNum() {
+        return serialNum;
+    }
+
+    public void setSerialNum(int serialNum) {
+        if (serialNum==0){
+            throw new IllegalArgumentException("serial number cannot be 0");
+        }
+        this.serialNum = serialNum;
+    }
+
+    public double getFrequency() {
+        return frequency;
+    }
+
+    public void setFrequency(double frequency) {
+        this.frequency = frequency;
+    }
+
+    public boolean isListening() {
+        return isListening;
+    }
+
+    public void setListening(boolean listening) {
+        isListening = listening;
+    }
+
+    public boolean isPoweredOn() {
+        return poweredOn;
+    }
+
+    public void setPoweredOn(boolean poweredOn) {
+        this.poweredOn = poweredOn;
+    }
+
+    public String getActivationPhrase() {
+        return activationPhrase;
+    }
+
+    public void setActivationPhrase(String activationPhrase) {
+        this.activationPhrase = activationPhrase;
+    }
+
+    public void setCustomPhrase(String customPhrase){
+        System.out.println("Custom activation phrase has been updated to: "+ customPhrase);
+        setActivationPhrase(customPhrase);
+    }
+    public void activelyListen(String activationPhrase){
+        if (activationPhrase.equals(this.getActivationPhrase())){
+            setListening(true);
+        }
+
+
+
+
+
+    }
+}
diff --git a/src/test/java/object/fredainsworth/RadioTest.java b/src/test/java/object/fredainsworth/RadioTest.java
new file mode 100644
index 0000000..ede20e0
--- /dev/null
+++ b/src/test/java/object/fredainsworth/RadioTest.java
@@ -0,0 +1,39 @@
+package object.fredainsworth;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class RadioTest {
+
+@Test
+public void constructorShouldCreateRadioWithValidData() {
+    Radio radio= new Radio(215302,911.0,"Dispatch!", true,false);
+    assertEquals(215302, radio.getSerialNum());
+    assertEquals(911.0, radio.getFrequency());
+    assertEquals("Dispatch!", radio.getActivationPhrase());
+    assertTrue(radio.isPoweredOn());
+    assertFalse(radio.isListening());
+}
+@Test
+public void doesActiveListeningWork(){
+    Radio radio= new Radio(215302,911.0,"Dispatch!", true,false);
+    radio.activelyListen("Dispatch!");
+    assertTrue(radio.isListening());
+}
+@Test
+public void doesSettingNewActivationPhraseWork(){
+    Radio radio= new Radio(215302,911.0,"Dispatch!", true,false);
+    radio.setCustomPhrase("Officer down!");
+    assertEquals("Officer down!",radio.getActivationPhrase());
+
+}
+@Test
+    public void serialNumber0ThrowsException(){
+    Radio radio= new Radio(215302,911.0,"Dispatch!", true,false);
+    assertThrows(
+            IllegalArgumentException.class,
+            () -> radio.setSerialNum(0));
+}
+
+}