diff --git a/README.md b/README.md
index 63638f0..e5a632e 100644
--- a/README.md
+++ b/README.md
@@ -14,24 +14,24 @@ use Sikofitt\GenerateMac\Mac;
 
 $mac = new Mac(); // default is ':'
 // or
-$mac->setSeparator(':');
+$mac->setSeparator(Mac::SEPARATOR_COLON);
 $address = $mac->getAddress(); // ab:cd:ef:01:23:45
 
-$mac = new Mac('-');
+$mac = new Mac(Mac::SEPARATOR_DASH);
 // or
-$mac->setSeparator('-');
+$mac->setSeparator(Mac::SEPARATOR_DASH);
 $address = $mac->getAddress(); // ab-cd-ef-01-23-45
 
-$mac = new Mac('');
+$mac = new Mac(Mac::SEPARATOR_NONE);
 // or
-$mac->setSeparator('');
+$mac->setSeparator(Mac::SEPARATOR_NONE);
 $address = $mac->getAddress(); // abcdef012345
 ```
 
 If you don't care that it is unique you can remove the check for private mac prefixes.
 
 ```php
-$mac = new Mac(':', false);
+$mac = new Mac(Mac::SEPARATOR_COLON, false);
 // or
 $mac->setUnique(false);
 
diff --git a/src/GenerateMac/Command/GenerateMacCommand.php b/src/GenerateMac/Command/GenerateMacCommand.php
index 23a21eb..0d224ab 100644
--- a/src/GenerateMac/Command/GenerateMacCommand.php
+++ b/src/GenerateMac/Command/GenerateMacCommand.php
@@ -29,7 +29,6 @@ use Symfony\Component\Console\Input\{
     InputInterface,
     InputOption
 };
-use Symfony\Component\Console\Output\ConsoleOutput;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 
diff --git a/src/GenerateMac/Mac.php b/src/GenerateMac/Mac.php
index 56d6f0b..bb8f47c 100644
--- a/src/GenerateMac/Mac.php
+++ b/src/GenerateMac/Mac.php
@@ -21,6 +21,9 @@ namespace Sikofitt\GenerateMac;
 
 class Mac
 {
+    public const SEPARATOR_COLON = 0;
+    public const SEPARATOR_DASH = 1;
+    public const SEPARATOR_NONE = 2;
     /**
      * Private mac address prefixes that are used
      * internally or with virtual machines and containers.
@@ -58,10 +61,6 @@ class Mac
           'xexxxx',
     ];
 
-    public const SEPARATOR_COLON = 0;
-    public const SEPARATOR_DASH = 1;
-    public const SEPARATOR_NONE = 2;
-
     /**
      * @internal
      * @var bool  For testing that we get a prefix that is not used.
@@ -177,6 +176,24 @@ class Mac
         return $this->separator;
     }
 
+    /**
+     * Helper to get the separator in string format
+     *
+     * @return string
+     */
+    public function getSeparatorAsString(): string
+    {
+        switch ($this->getSeparator()) {
+            default:
+            case self::SEPARATOR_COLON:
+                return ':';
+            case self::SEPARATOR_DASH:
+                return '-';
+            case self::SEPARATOR_NONE:
+                return '';
+        }
+    }
+
     /**
      * Test to see if we have a unique prefix.
      *
@@ -219,19 +236,6 @@ class Mac
         return \current($prefixes);
     }
 
-    private function getSeparatorAsString(): string
-    {
-        switch($this->getSeparator()) {
-            default:
-            case self::SEPARATOR_COLON:
-                return ':';
-            case self::SEPARATOR_DASH:
-                return '-';
-            case self::SEPARATOR_NONE:
-                return '';
-        }
-    }
-
     /**
      * Inserts the chosen separator.
      *
@@ -241,7 +245,6 @@ class Mac
      */
     private function insertSeparator(string $macAddress): string
     {
-
         return implode($this->getSeparatorAsString(), str_split($macAddress, 2));
     }
 }