diff --git a/src/main/java/com/amihaiemil/charles/aws/AbstractSystemProperty.java b/src/main/java/com/amihaiemil/charles/aws/AbstractSystemProperty.java
new file mode 100644
index 0000000..7bff77e
--- /dev/null
+++ b/src/main/java/com/amihaiemil/charles/aws/AbstractSystemProperty.java
@@ -0,0 +1,56 @@
+/**@g
+ * Copyright (c) 2016-2017, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  1)Redistributions of source code must retain the above copyright notice,
+ *  this list of conditions and the following disclaimer.
+ *  2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *  3)Neither the name of charles-rest nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.charles.aws;
+
+/**
+ * AbstractSystemProperty implementing methods that should be the same
+ * accross all final implementations of {@link SystemProperty}.
+ * @author Sherif Waly (sherifwaly@gmail.com)
+ * @version $Id$
+ * @since 1.0.0 
+ * @todo #201:15m/DEV Add fake implementation for the 4 SystemProperty
+ * interfaces to use them in testing.
+ */
+abstract class AbstractSystemProperty implements SystemProperty {
+
+    /**
+     * Name of the system Property.
+     */
+    private String name;
+    
+    /**
+     * Ctor
+     * @param String name.
+     */
+    public AbstractSystemProperty(String name) {
+        this.name = name;
+    }
+
+	@Override
+    public String read() {
+        return System.getProperty(this.name);
+    }
+}
diff --git a/src/main/java/com/amihaiemil/charles/aws/StAccessKeyId.java b/src/main/java/com/amihaiemil/charles/aws/StAccessKeyId.java
new file mode 100644
index 0000000..a1e5d5a
--- /dev/null
+++ b/src/main/java/com/amihaiemil/charles/aws/StAccessKeyId.java
@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2016-2017, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  1)Redistributions of source code must retain the above copyright notice,
+ *  this list of conditions and the following disclaimer.
+ *  2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *  3)Neither the name of charles-rest nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.charles.aws;
+
+/**
+ * Implementation for {@link AccessKeyId} interface.
+ * @author Sherif Waly (sherifwaly95@gmail.com)
+ * @version $Id$
+ * @since 1.0.0
+ */
+public final class StAccessKeyId extends AbstractSystemProperty implements SecretKey {
+    
+    /**
+     * Ctor. 
+     * @param String name
+     */
+    public StAccessKeyId(final String name) {
+        super(name);
+    }
+
+}
diff --git a/src/main/java/com/amihaiemil/charles/aws/StEsEndPoint.java b/src/main/java/com/amihaiemil/charles/aws/StEsEndPoint.java
new file mode 100644
index 0000000..0c75a2c
--- /dev/null
+++ b/src/main/java/com/amihaiemil/charles/aws/StEsEndPoint.java
@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2016-2017, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  1)Redistributions of source code must retain the above copyright notice,
+ *  this list of conditions and the following disclaimer.
+ *  2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *  3)Neither the name of charles-rest nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.charles.aws;
+
+/**
+ * Implementation for {@link EsEndPoint} interface.
+ * @author Sherif Waly (sherifwaly95@gmail.com)
+ * @version $Id$
+ * @since 1.0.0
+ */
+public final class StEsEndPoint extends AbstractSystemProperty implements EsEndPoint {
+    
+    /**
+     * Ctor. 
+     * @param String name
+     */
+    public StEsEndPoint(final String name) {
+        super(name);
+    }
+
+}
diff --git a/src/main/java/com/amihaiemil/charles/aws/StRegion.java b/src/main/java/com/amihaiemil/charles/aws/StRegion.java
new file mode 100644
index 0000000..8261396
--- /dev/null
+++ b/src/main/java/com/amihaiemil/charles/aws/StRegion.java
@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2016-2017, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  1)Redistributions of source code must retain the above copyright notice,
+ *  this list of conditions and the following disclaimer.
+ *  2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *  3)Neither the name of charles-rest nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.charles.aws;
+
+/**
+ * Implementation for {@link SecretKey} interface.
+ * @author Sherif Waly (sherifwaly95@gmail.com)
+ * @version $Id$
+ * @since 1.0.0
+ */
+public final class StRegion extends AbstractSystemProperty implements SecretKey {
+    
+    /**
+     * Ctor. 
+     * @param String name
+     */
+    public StRegion(final String name) {
+        super(name);
+    }
+
+}
diff --git a/src/main/java/com/amihaiemil/charles/aws/StSecretKey.java b/src/main/java/com/amihaiemil/charles/aws/StSecretKey.java
new file mode 100644
index 0000000..f36a0c6
--- /dev/null
+++ b/src/main/java/com/amihaiemil/charles/aws/StSecretKey.java
@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2016-2017, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  1)Redistributions of source code must retain the above copyright notice,
+ *  this list of conditions and the following disclaimer.
+ *  2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *  3)Neither the name of charles-rest nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.charles.aws;
+
+/**
+ * Implementation for {@link SecretKey} interface.
+ * @author Sherif Waly (sherifwaly95@gmail.com)
+ * @version $Id$
+ * @since 1.0.0
+ */
+public final class StSecretKey extends AbstractSystemProperty implements SecretKey {
+    
+    /**
+     * Ctor. 
+     * @param String name
+     */
+    public StSecretKey(final String name) {
+        super(name);
+    }
+
+}
diff --git a/src/main/java/com/amihaiemil/charles/aws/SystemProperty.java b/src/main/java/com/amihaiemil/charles/aws/SystemProperty.java
index 982cbb5..c8e5cb3 100644
--- a/src/main/java/com/amihaiemil/charles/aws/SystemProperty.java
+++ b/src/main/java/com/amihaiemil/charles/aws/SystemProperty.java
@@ -30,9 +30,6 @@
  * @author Sherif Waly (sherifwaly95@gmail.com)
  * @version $Id$
  * @since 1.0.0
- * @todo #199:30m/DEV Implement and Unit test 4 system properties 
- *  SecretKey, Region, EsEndPoint and AccessKeyId. Also add fake
- *  implementation for the interfaces to use them in testing.
  */
 public interface SystemProperty {