diff --git a/app/strings.py b/app/strings.py
new file mode 100644
index 0000000..2e1e774
--- /dev/null
+++ b/app/strings.py
@@ -0,0 +1,37 @@
+tnv_string = "Tn-V"
+tnd_string = "Tn-D"
+
+conditional_response = [{
+    "text": "fichado",
+    "text2": "fichar",
+    "emoji": "🕐🏢🏃‍♂️🏡"
+},{
+    "text": "desfichado",
+    "text2": "desfichar",
+    "emoji": "🏡🏃‍♂️🏢🕐"
+}]
+
+user_agent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36"
+tn_u = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36"
+
+responses = {
+    "check successful": "Has %s correctamente a las %s",
+}
+
+messages = {
+    "waiting": "Esperando %s segundos para %s en un minuto aleatorio",
+    "debug": "Corriendo en modo debug. No se realizará ninguna acción",
+    "success": "🟢🕐 %s correctamente a las %s",
+}
+
+errors = {
+    "login": "🟥🕐 Error al iniciar sesión: %s",
+    "get_checks": "🟥🕐 Error al obtener los checks: %s",
+    "post_checks": "🟥🕐 Error al hacer check: %s - %s",
+    "no_valid_worker": "🟥🕐 El trabajador no ha podido ser identificado",
+    "check_failed": "🟥🕐 No se ha podido fichar, la web no ha devuelto 200 OK",
+    "check_already_done": "🟥🕐 Ya se ha realizado este marcaje antes a las %s",
+    "calendar_check": "🟥🕐 Comprobación de calendario: %s",
+    "general_error": "🟥🕐 Error: %s",
+    
+}
\ No newline at end of file
diff --git a/app/timenet_manager.py b/app/timenet_manager.py
index 2632ff5..7714ddb 100644
--- a/app/timenet_manager.py
+++ b/app/timenet_manager.py
@@ -9,19 +9,7 @@ from app import arg_parser, config_parser, telegram_bot, google_calendar, utils
 args = arg_parser.ArgParser().parse()
 config = config_parser.ConfigParser().loadConfig()
 
-tnv_string = "Tn-V"
-tnd_string = "Tn-D"
-
-
-conditional_response = [{
-    "text": "fichado",
-    "text2": "fichar",
-    "emoji": "🕐🏢🏃‍♂️🏡"
-},{
-    "text": "desfichado",
-    "text2": "desfichar",
-    "emoji": "🏡🏃‍♂️🏢🕐"
-}]
+from app import strings
 
 class timenetManager:
     telegram = None
@@ -45,9 +33,9 @@ class timenetManager:
             "Sec-Fetch-Dest": "empty",
             "Sec-Fetch-Mode": "cors",
             "Sec-Fetch-Site": "same-origin",
-            tnv_string: "wcp_8.0.0.2",
-            "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36",
-            "Tn-U": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36"
+            strings.tnv_string: "wcp_8.0.0.2",
+            "User-Agent": strings.user_agent,
+            "Tn-U": strings.tn_u
         }
         self.login()
 
@@ -91,11 +79,11 @@ class timenetManager:
 
     def updateTime(self):
         now = datetime.now().astimezone(pytz.UTC)
-        self.headers[tnd_string] = "\"" + now.strftime("%Y-%m-%dT%H:%M:%SZ") + "\""
+        self.headers[strings.tnd_string] = "\"" + now.strftime("%Y-%m-%dT%H:%M:%SZ") + "\""
         self.headers["dStr"] = "\"" + now.strftime("%d/%m/%Y %H:%M:%S") + "\""
 
     def updateVersion(self):
-        self.headers[tnv_string] = self.getVersion()
+        self.headers[strings.tnv_string] = self.getVersion()
 
     def getVersion(self):
         self.updateTime()
@@ -113,7 +101,7 @@ class timenetManager:
         
         
         today_checks = json.loads(response.text)
-        if today_checks['C'] and today_checks['C'][0]['C'][-1]['T'] == typ:
+        if today_checks['C'] and today_checks['C'][0] and today_checks['C'][0]['C'] and today_checks['C'][0]['C'][-1] and today_checks['C'][0]['C'][-1]['T'] == typ:
             self.addMessage("Ya se ha realizado este marcaje antes a las %s" % today_checks['C'][0]['C'][-1]['H'])
             self.sendReport()
             return True
@@ -156,13 +144,13 @@ class timenetManager:
         if not args.debug:
             self.addMessage("####HACIENDO CHECK####")
             rand = utils.numero_aleatorio_con_probabilidad(230, 0.5)
-            self.addMessage("Esperando %s segundos para %s en un minuto aleatorio" % (rand,conditional_response[int(typ)]["text2"]))
+            self.addMessage("Esperando %s segundos para %s en un minuto aleatorio" % (rand,strings.conditional_response[int(typ)]["text2"]))
             self.sendReport()
             sleep(rand)
             self.updateTime()
             data = {
                 "typ": typ,
-                "date": self.headers[tnd_string],
+                "date": self.headers[strings.tnd_string],
                 "geoLatitude": config['geo']['latitude'],
                 "geoLongitude": config['geo']['longitude'],
                 "geoError": "",
@@ -193,7 +181,7 @@ class timenetManager:
                 self.addMessage("🕐 Ya se ha realizado este marcaje antes a las %s" % time)
             else:
                 time = datetime.now().astimezone(pytz.timezone("Europe/Madrid")).strftime("%H:%M")
-                self.addMessage('%s Has %s correctamente a las %s' % (conditional_response[int(typ)]['emoji'], conditional_response[int(typ)]['text'], time))
+                self.addMessage('%s Has %s correctamente a las %s' % (strings.conditional_response[int(typ)]['emoji'], strings.conditional_response[int(typ)]['text'], time))
         else:
             self.addMessage("🟥🕐 No se ha podido fichar, la web no ha devuelto 200 OK")