diff --git a/config.json b/config.json
index 853a458..dd0bc65 100644
--- a/config.json
+++ b/config.json
@@ -5,35 +5,34 @@
   },
   "watchers": [
     {
-      "device": "usb-Razer_Razer_Blade_Stealth-if01-event-kbd",
+      "device": "/dev/input/event10",
       "keys": [
         {
-          "key": "f9",
+          "key": "enter",
           "type": "keydown",
           "command": "notify-send",
           "args": [
-            "F9 DOWN",
-            "$(date)"
+            "{{ key }}",
+            "{{ type }}"
           ]
         },
         {
-          "key": "f8",
+          "key": "esc",
           "type": "keyup",
-          "delay": 2000,
           "command": "notify-send",
           "args": [
-            "F8 UP",
-            "$(date)"
+            "{{ key }}",
+            "{{ type }}"
           ]
         },
         {
-          "key": "f7",
+          "key": "space",
           "type": "keyhold",
           "delay": 1000,
           "command": "notify-send",
           "args": [
-            "F7 HOLD",
-            "$(date)"
+            "{{ key }}",
+            "{{ type }}"
           ]
         }
       ]
diff --git a/libs/keyfilter.js b/libs/keyfilter.js
index 24c1f11..18b6056 100644
--- a/libs/keyfilter.js
+++ b/libs/keyfilter.js
@@ -1,5 +1,3 @@
-const logger = require('./logger.js');
-
 const FILTER_START = 'Testing ... (interrupt to exit)';
 
 const KEY_PREFIX = 'KEY_';
@@ -79,6 +77,9 @@ class Keyfilter {
         }
         return new Date().getTime() - action.executed < action.delay;
     }
+    isValid() {
+        return this.actions != undefined && this.actions.size > 0;
+    }
 }
 
 module.exports = Keyfilter;
\ No newline at end of file
diff --git a/libs/logger.js b/libs/logger.js
index f1980ad..d875147 100644
--- a/libs/logger.js
+++ b/libs/logger.js
@@ -11,8 +11,11 @@ const LOGLEVEL_INFO = 1;
 const LOGLEVEL_WARNING = 2;
 const LOGLEVEL_ERROR = 3;
 
-// set loglevel on 'require'
-const loglevel = function () {
+const loglevel = getLogLevel();
+const timestamp = getTimestamp();
+
+// get the loglevel
+function getLogLevel() {
     switch (config.log.level) {
         case LOG_PREFIX_DEBUG:
         case LOGLEVEL_DEBUG:
@@ -29,7 +32,15 @@ const loglevel = function () {
         default:
             return LOGLEVEL_INFO;
     }
-}();
+}
+
+// get the timestamp format
+function getTimestamp() {
+    if (config != undefined && config.log != undefined && config.log.format != undefined) {
+        return config.log.timestamp;
+    }
+    return "DD.MM.YYYY HH:mm:ss:SS";
+}
 
 // prefix log with 'info'
 function info(message) {
@@ -60,6 +71,12 @@ function error(message) {
     if (loglevel > LOGLEVEL_ERROR) {
         return;
     }
+    if (message.errors != undefined) {
+        for (var index = 0; index < message.errors.length; index++) {
+            trace(message.errors[index], 'error');
+        }
+        return;
+    }
     trace(message, 'error');
 }
 
@@ -85,7 +102,7 @@ function trace(message, prefix) {
         default:
             print = console.log;
     }
-    message = moment().format(config.log.timestamp) + ' | ' + prefix + ' > ' + message;
+    message = moment().format(timestamp) + ' | ' + prefix + ' > ' + message;
     print(message);
 }
 
diff --git a/libs/util.js b/libs/util.js
index 7489e2c..3977a06 100644
--- a/libs/util.js
+++ b/libs/util.js
@@ -4,7 +4,7 @@ const stat = require('fs/promises').stat;
 function fileExists(file) {
     return new Promise((resolve, reject) => {
         if (file == undefined) {
-            reject('error: no file given');
+            reject('can not check the existence of an undefined file');
         }
         resolvePath(file)
             .then((path) => {
@@ -20,12 +20,12 @@ function fileExists(file) {
 function resolvePath(file) {
     return new Promise((resolve, reject) => {
         if (file == undefined) {
-            reject('error: no file given');
+            reject('can not resolve a path to an undefined file');
         }
         realpath(file)
             .then(resolve)
             .catch((err) => {
-                reject('error: resolving path \'' + file + '\' encountered an error >>> ' + err);
+                reject('resolving path \'' + file + '\' encountered an error >>> ' + err);
             });
     });
 }
diff --git a/libs/watcher.js b/libs/watcher.js
index a7608e0..62bba09 100644
--- a/libs/watcher.js
+++ b/libs/watcher.js
@@ -15,9 +15,6 @@ class Watcher {
         for (var key in config) {
             this[key] = config[key];
         }
-        // if (!this.device.startsWith(inputDevices)) {
-        //     this.device = inputDevices + this.device;
-        // }
         this.keyfilter = new Keyfilter(config.keys);
         this.callback = callback;
     }
@@ -99,17 +96,19 @@ class Watcher {
         }
         logger.debug('adding error listener to \'' + this.device + '\'...');
         this.process.on('error', (err) => {
-            logger.error('error: watcher \'' + this.device + '\' encountered an error >>> ' + err);
+            logger.error('watcher \'' + this.device + '\' encountered an error >>> ' + err);
         });
     }
     check() {
         return new Promise((resolve, reject) => {
-            Promise.any([inputDevices + this.device, inputDevicesById + this.device].map(util.fileExists))
+            if (!this.keyfilter.isValid()) {
+                reject('no key(s) defined for watcher \'' + this.device + '\'');
+            }
+            Promise.any([this.device, inputDevices + this.device, inputDevicesById + this.device].map(util.fileExists))
                 .then((result) => {
                     if (result.path != this.device) {
                         logger.info('resolved watcher for device \'' + this.device + '\' to \'' + result.path + '\'')
                     }
-                    logger.info('resolved ')
                     this.device = result.path;
                     resolve();
                 })
diff --git a/libs/watchers.js b/libs/watchers.js
index 4e250c1..227d539 100644
--- a/libs/watchers.js
+++ b/libs/watchers.js
@@ -7,7 +7,7 @@ const watchers = [];
 function initialize() {
     return new Promise(function (resolve, reject) {
         if (configJSON == undefined || configJSON.watchers == undefined || configJSON.watchers.length == 0) {
-            reject('error: no input devices defined');
+            reject('no watchers in \'config.json\' defined');
         }
         var tmp = []
         for (var index = 0; index < configJSON.watchers.length; index++) {
@@ -23,12 +23,12 @@ function check(watcher) {
         }
         watcher.check()
             .then(() => {
-                logger.info('watcher \'' + watcher.device)
+                logger.info('watcher \'' + watcher.device + '\' initialized and capturing configured events...');
                 watcher.start();
                 watchers.push(watcher);
             })
             .catch((err) => {
-                logger.error(err);d
+                logger.error(err);
             });
     });
 }
diff --git a/package.json b/package.json
index b8bbbd9..3938fb8 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "node input watcher",
   "main": "ninwa.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"error: no test specified\" && exit 1"
   },
   "repository": {
     "type": "git",