diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..cac3fef
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,3 @@
+PV_PREFIX=
+DEVICE_PITCH_URI= # xi-com:///...
+DEVICE_YAW_URI= # xi-com:///...
diff --git a/.gitignore b/.gitignore
index 4ef9e8c..5632b48 100644
--- a/.gitignore
+++ b/.gitignore
@@ -71,6 +71,7 @@ lockfiles/
 .ruff_cache/
 
 .env
-gui/
+bob/
+bob_custom/
 virt/
 home.yaml
diff --git a/pyproject.toml b/pyproject.toml
index 26418b7..5c9f90f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ version_file = "src/fastcs_standa_mirror/_version.py"
 
 [tool.pyright]
 typeCheckingMode = "standard"
-reportMissingImports = false # Ignore missing stubs in imported modules
+reportMissingImports = false  # Ignore missing stubs in imported modules
 
 [tool.pytest.ini_options]
 # Run pytest with all our checkers, and don't spam us with massive tracebacks on error
@@ -113,7 +113,7 @@ commands = [
 description = "Run tests with coverage"
 commands = [
     [
-        "pytest", 
+        "pytest",
         "--cov=fastcs_standa_mirror",
         "--cov-report",
         "term",
diff --git a/src/fastcs_standa_mirror/__main__.py b/src/fastcs_standa_mirror/__main__.py
index 1fee9ae..3bda0a0 100644
--- a/src/fastcs_standa_mirror/__main__.py
+++ b/src/fastcs_standa_mirror/__main__.py
@@ -33,25 +33,39 @@ def main() -> None:
         version=__version__,
     )
     parser.add_argument(
-        "--use-virtual",
+        "--sim",
         action="store_true",
-        dest="use_virtual",
-        help="Enable virtual mode",
+        dest="use_sim",
+        help="Use simulated device",
     )
 
     parsed_args = parser.parse_args()
-    use_virtual = parsed_args.use_virtual
+    use_sim = parsed_args.use_sim
 
-    # initial varaiables setup
-    load_dotenv()
+    # Validate device URIs and PV_PREFIX only if not using simulation
+    if not use_sim:
+        load_dotenv()
+
+        pv_prefix = os.getenv("PV_PREFIX")
+        print(pv_prefix)
+        if pv_prefix is None:
+            raise ValueError("PV_PREFIX environment variable must be set")
+
+        device_pitch_uri = os.getenv("DEVICE_PITCH_URI")
+        device_yaw_uri = os.getenv("DEVICE_YAW_URI")
+        if device_pitch_uri is None or device_yaw_uri is None:
+            raise ValueError("DEVICE_PITCH_URI and DEVICE_YAW_URI must be set")
+
+    else:
+        pv_prefix = "MIRROR-SIM-001"
+        logging.info(f"Simulated device PV_PREFIX -> {pv_prefix}")
 
-    pv_prefix = os.getenv("PV_PREFIX", "STANDA-MIRROR")
     home_positions = load_or_create_home_pos()
-    uris = load_devices(use_virtual=use_virtual)
+    uris = load_devices(use_sim=use_sim)
 
-    # epics setupo
+    # epics setup
     gui_options = EpicsGUIOptions(
-        output_path=Path(".") / "gui/Mirror.bob", title="Mirror Controller"
+        output_path=Path(".") / "bob/Mirror.bob", title="Mirror Controller"
     )
 
     epics_ca = EpicsCATransport(
diff --git a/src/fastcs_standa_mirror/motor_controller.py b/src/fastcs_standa_mirror/motor_controller.py
index 1276e2c..649156a 100644
--- a/src/fastcs_standa_mirror/motor_controller.py
+++ b/src/fastcs_standa_mirror/motor_controller.py
@@ -30,7 +30,7 @@ def __init__(self, name: str, device_uri: str):
             self.motor = ximc.Axis(self._device_uri)
             self.motor.open_device()
             logging.info(
-                f"Successfully opened device\n'{self._name}' at {self._device_uri}"
+                f"Successfully opened device -> '{self._name}' at {self._device_uri}"
             )
 
         except Exception as e:
diff --git a/src/fastcs_standa_mirror/utils.py b/src/fastcs_standa_mirror/utils.py
index f3ad35c..25a2dab 100644
--- a/src/fastcs_standa_mirror/utils.py
+++ b/src/fastcs_standa_mirror/utils.py
@@ -12,10 +12,10 @@ class DeviceNotFoundError(Exception):
     pass
 
 
-def load_devices(use_virtual: bool) -> dict:
+def load_devices(use_sim: bool) -> dict:
     """Load device uris for pitch and yaw controllers"""
 
-    return create_virtual_devices() if use_virtual else load_real_devices()
+    return create_simulated_devices() if use_sim else load_real_devices()
 
 
 def load_real_devices() -> dict:
@@ -55,13 +55,13 @@ def load_real_devices() -> dict:
     return target_uris
 
 
-def create_virtual_devices() -> dict:
-    """Create virtual devices and return uris"""
-    logging.info("Creating virtual standa devices")
+def create_simulated_devices() -> dict:
+    """Create simulated devices and return uris"""
+    logging.info("Creating simulated standa devices")
 
     virt_dir = Path.cwd() / "virt"
 
-    device_uri_base = f"xi-emu:///{virt_dir}/virtual_motor_controller"
+    device_uri_base = f"xi-emu:///{virt_dir}/simulated_motor_controller"
 
     return {
         "pitch": f"{device_uri_base}_pitch.bin",