diff --git a/B737-800X/flaps.yaml b/B737-800X/flaps.yaml
index 738689a..78663d5 100644
--- a/B737-800X/flaps.yaml
+++ b/B737-800X/flaps.yaml
@@ -19,67 +19,67 @@ actions:
     name: move flaps up
     type: single
     icon: red-button
-    label: Move Up
+    label: MOVE UP
     command: FlyWithLua/B738/Cmd_MP_Flaps_Up
   - index: 19
     name: flaps up
     type: single
     icon: orange-button
-    label: Flaps Up
+    label: UP
     command: laminar/B738/push_button/flaps_0
   - index: 20
     name: flaps 1
     type: single
     icon: orange-button
-    label: Flaps 1
+    label: 1
     command: laminar/B738/push_button/flaps_1
   - index: 21
     name: flaps 5
     type: single
     icon: orange-button
-    label: Flaps 5
+    label: 5
     command: laminar/B738/push_button/flaps_5
   - index: 22
     name: flaps 15
     type: single
     icon: orange-button
-    label: Flaps 15
+    label: 15
     command: laminar/B738/push_button/flaps_15
   - index: 23
     name: flaps 30
     type: single
     icon: orange-button
-    label: Flaps 30
+    label: 30
     command: laminar/B738/push_button/flaps_30
   - index: 26
     name: move flaps down
     type: single
     icon: blue-button
-    label: Move Down
+    label: MOVE DOWN
     command: FlyWithLua/B738/Cmd_MP_Flaps_Dn
   - index: 28
     name: flaps 2
     type: single
     icon: orange-button
-    label: Flaps 2
+    label: 2
     command: laminar/B738/push_button/flaps_2
   - index: 29
     name: flaps 10
     type: single
     icon: orange-button
-    label: Flaps 10
+    label: 10
     command: laminar/B738/push_button/flaps_10
   - index: 30
     name: flaps 25
     type: single
     icon: orange-button
-    label: Flaps 25
+    label: 25
     command: laminar/B738/push_button/flaps_25
   - index: 31
     name: flaps 40
     type: single
     icon: orange-button
-    label: Flaps 40
+    label: 40
     command: laminar/B738/push_button/flaps_40
 
 
diff --git a/B737-800X/lowerovhd.yaml b/B737-800X/lowerovhd.yaml
index 6252344..0281625 100644
--- a/B737-800X/lowerovhd.yaml
+++ b/B737-800X/lowerovhd.yaml
@@ -70,7 +70,7 @@ actions:
     file-names:
       - red0
       - blue2
-    label: TAXI LIGHTS
+    label: TAXI LT
     dataref: laminar/B738/toggle_switch/taxi_light_brightness_pos
     dataref-states:
       - 0.0
@@ -91,7 +91,7 @@ actions:
     file-names:
       - red0
       - blue2
-    label: WING LIGHTS
+    label: WING LT
     dataref: sim/cockpit2/switches/generic_lights_switch[0]
     command: laminar/B738/switch/wing_light_toggle
   - index: 21
@@ -109,7 +109,7 @@ actions:
     file-names:
       - red0
       - blue2
-    label: BEACON LIGHTS
+    label: BEACON LT
     dataref: sim/cockpit/electrical/beacon_lights_on
     command: sim/lights/beacon_lights_toggle
   - index: 20
@@ -133,7 +133,7 @@ actions:
     file-names:
       - red0
       - blue2
-    label: LOGO LIGHTS
+    label: LOGO LT
     dataref: laminar/B738/toggle_switch/logo_light
     command: laminar/B738/switch/logo_light_toggle
   - index: 13
diff --git a/config.yaml b/config.yaml
index 4303d93..79d1ea6 100644
--- a/config.yaml
+++ b/config.yaml
@@ -1,16 +1,19 @@
-aircraft: B738X
+# X-Plane server UDP settings
 xp-ip: 127.0.0.1
 xp-port: 49000
 server-ip: 127.0.0.1
 server-port: 49008
+# font used for labels (displays use different one)
 default-font: IBMPlexMono-Bold.ttf
 default-font-size: 13
+# set False if you want lower case labels
+always-upper-case: True
 # comment out following line to disable image caching
 # the images will have to load for several seconds every time, but it is suitable for tweaking
 cache-path: ./img-cache.pkl
 brightness: 75
 # the first one is taken as active for the session
 stream-decks:
-  - serial: CL41I1A00651
-    keys: 32
+  - serial: CL41I1A00651 # ! CHANGE THIS VALUE !
+    keys: 32 # ! VERIFY THIS VALUE !
     directory: B737-800X
diff --git a/main.py b/main.py
index 7e166e8..9df9798 100644
--- a/main.py
+++ b/main.py
@@ -1,6 +1,5 @@
 import math
 import pickle
-import threading
 import time
 from os.path import exists
 
@@ -182,7 +181,6 @@ def main():
         exit(1)
 
     # loading info and check for connected SD count == config.yaml SD count
-    print("config loaded for: {}".format(global_cfg["aircraft"]))
     print("configuration for {} decks, {} connected".format(len(global_cfg["stream-decks"]), deck_count))
     if len(global_cfg["stream-decks"]) != deck_count:
         print("WARN: configuration is for {} decks, but {} connected"
@@ -229,7 +227,8 @@ def main():
     if not caching_enabled:
         print("note: caching is disabled, loading will be noticeably slower")
         print("you can enable it by setting the field 'cache-path' in config.yaml")
-        images_all = preprocessing.load_images_datarefs_all(current_deck, presets_all)
+        images_all = preprocessing.load_images_datarefs_all(
+            current_deck, presets_all, global_cfg["always-upper-case"])
     elif load_cached_img:
         # images are stored as cache, open and load
         print("cache file {} is present, skipping pre-generation.".format(cache_path))
@@ -242,7 +241,8 @@ def main():
     else:
         # caching is enabled, but cache file not found
         print("cache file {} not found, starting the pre-generation.".format(cache_path))
-        images_all = preprocessing.load_images_datarefs_all(current_deck, presets_all)
+        images_all = preprocessing.load_images_datarefs_all(
+            current_deck, presets_all, global_cfg["always-upper-case"])
         # save images to cache-path
         print("saving the pregen to {}".format(cache_path))
         with open(cache_path, 'wb') as f:
diff --git a/preprocessing.py b/preprocessing.py
index d45e5a0..5239f7c 100644
--- a/preprocessing.py
+++ b/preprocessing.py
@@ -70,7 +70,11 @@ def __init__(self, index, name, icon, cmd_type, label=None, dataref=None, datare
             print("WARN: {} has no set type, setting none as default (no press action)".format(name))
             self.cmd_type = "none"
 
+        # verify string type
+        if label:
+            label = str(label)
         self.label = label
+
         self.dataref = dataref
         if dataref_multiplier is None:
             self.dataref_multiplier = 1.0
@@ -283,7 +287,7 @@ def load_datarefs(presets_all):
 
 
 # taken from https://python-elgato-streamdeck.readthedocs.io/en/stable/examples/basic.html
-def render_key_image(deck, icon_filename, label_text):
+def render_key_image(deck, icon_filename, label_text, only_uppercase=False):
     # Resize the source image asset to best-fit the dimensions of a single key,
     # leaving a margin at the bottom so that we can draw the key title
     # afterwards.
@@ -295,12 +299,16 @@ def render_key_image(deck, icon_filename, label_text):
     draw = ImageDraw.Draw(image)
     global DEFAULT_FONT
     if label_text:
+        if only_uppercase and not label_text.isupper():
+            print("WARN: label {} is not upper case only, "
+                  "converting to upper (to disable this check out 'config.yaml'".format(label_text))
+            label_text = label_text.upper()
         draw.text((image.width / 2, image.height - 8), text=label_text, font=DEFAULT_FONT, anchor="ms", fill="white")
 
     return PILHelper.to_native_format(deck, image)
 
 
-def load_images_datarefs(deck, presets_dir):
+def load_images_datarefs(deck, presets_dir, only_uppercase):
     set_images = {}
     for _, button in enumerate(presets_dir):
         if button is None:
@@ -327,7 +335,7 @@ def load_images_datarefs(deck, presets_dir):
 
         for i, state_name in enumerate(button.file_names):
             if state_name not in set_images:
-                state_image = render_key_image(deck, state_name, button.label)
+                state_image = render_key_image(deck, state_name, button.label, only_uppercase)
 
                 # change file_names in preset according to images_all, allowing same icons with different labels
                 # notice how this is executed in the post-processing stage
@@ -341,10 +349,10 @@ def load_images_datarefs(deck, presets_dir):
     return set_images
 
 
-def load_images_datarefs_all(deck, presets_all):
-    set_images_all = {"none.png": render_key_image(deck, get_filename_button_static_png("none"), None)}
+def load_images_datarefs_all(deck, presets_all, only_uppercase):
+    set_images_all = {"none.png": render_key_image(deck, get_filename_button_static_png("none"), None, only_uppercase)}
     for _, dataref_dir in presets_all.items():
-        images_single_dir = load_images_datarefs(deck, dataref_dir)
+        images_single_dir = load_images_datarefs(deck, dataref_dir, only_uppercase)
         set_images_all.update(images_single_dir)
 
     return set_images_all