diff --git a/lib/noble-device.js b/lib/noble-device.js
index 9a1a317..ef616b8 100644
--- a/lib/noble-device.js
+++ b/lib/noble-device.js
@@ -1,5 +1,5 @@
-var events = require('events');
-var util = require('util');
+var EventEmitter = require('events').EventEmitter;
+var util = require('./util');
 
 var GENERIC_ACCESS_UUID                     = '1800';
 var DEVICE_NAME_UUID                        = '2a00';
@@ -16,7 +16,113 @@ function NobleDevice(peripheral) {
   this.connectedAndSetUp = false;
 }
 
-util.inherits(NobleDevice, events.EventEmitter);
+util.inherits(NobleDevice, EventEmitter);
+
+NobleDevice.SCAN_UUIDS = [];
+NobleDevice.SCAN_DUPLICATES = false;
+
+NobleDevice.is = function(peripheral) {
+  return true;
+};
+
+NobleDevice.emitter = new EventEmitter();
+
+NobleDevice.onDiscover = function(peripheral) {
+  if (this.is(peripheral)) {
+    var device = new this(peripheral);
+
+    this.emitter.emit('discover', device);
+  }
+};
+
+NobleDevice.onStateChange = function(state) {
+  if (state === 'poweredOn' && this.emitter.listeners('discover').length > 0) {
+    this.startScanning();
+  }
+};
+
+NobleDevice.startScanning = function() {
+  noble.startScanning(this.SCAN_UUIDS, this.SCAN_DUPLICATES);
+};
+
+NobleDevice.stopScanning = function() {
+  noble.stopScanning();
+};
+
+NobleDevice.discoverAll = function(callback) {
+  this.emitter.addListener('discover', callback);
+
+  if (this.emitter.listeners('discover').length === 1) {
+    noble.on('discover', this.onDiscover);
+    noble.on('stateChange', this.onStateChange);
+
+    if (noble.state === 'poweredOn') {
+      this.startScanning();
+    }
+  }
+};
+
+NobleDevice.stopDiscoverAll = function(discoverCallback) {
+  this.emitter.removeListener('discover', discoverCallback);
+
+  if (this.emitter.listeners('discover').length === 0) {
+    noble.removeListener('discover', this.onDiscover);
+    noble.removeListener('stateChange', this.onStateChange);
+
+    this.stopScanning();
+  }
+};
+
+NobleDevice.discover = function(callback) {
+  var onDiscover = function(device) {
+    this.stopDiscoverAll(onDiscover);
+
+    callback(device);
+  };
+
+  callback._nobleDeviceOnDiscover = onDiscover;
+
+  this.discoverAll(onDiscover);
+};
+
+NobleDevice.stopDiscover = function(callback) {
+  var onDiscover = callback._nobleDeviceOnDiscover;
+
+  if (onDiscover) {
+    this.stopDiscoverAll(onDiscover);
+  }
+};
+
+NobleDevice.discoverWithFilter = function(filter, callback) {
+  var onDiscoverWithFilter = function(device) {
+    if (filter(device)) {
+      this.stopDiscoverAll(onDiscoverWithFilter);
+
+      callback(device);
+    }
+  };
+
+  this.discoverAll(onDiscoverWithFilter);
+};
+
+NobleDevice.discoverById = function(id, callback) {
+  this.discoverWithFilter(function(device) {
+    return (device.id === id);
+  }, callback);
+};
+
+// deprecated
+NobleDevice.discoverByUuid = function(uuid, callback) {
+  this.discoverWithFilter(function(device) {
+    return (device.uuid === uuid);
+  }, callback);
+};
+
+NobleDevice.discoverByAddress = function(address, callback) {
+  this.discoverWithFilter(function(device) {
+    return (device.address === address);
+  }, callback);
+};
 
 NobleDevice.prototype.onDisconnect = function() {
   this.connectedAndSetUp = false;
diff --git a/lib/util.js b/lib/util.js
index 054ce8a..d7cec1b 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -1,125 +1,14 @@
-var events = require('events');
-var util   = require('util');
-
-var noble  = require('noble');
-
-var EventEmitter = events.EventEmitter;
-
-var NobleDevice = require('./noble-device');
-
 function Util() {
 }
 
-Util.inherits = function(constructor, superConstructor) {
-  util.inherits(constructor, superConstructor);
-
-  if (superConstructor === NobleDevice) {
-    constructor.SCAN_UUIDS = constructor.SCAN_UUIDS || [];
-    constructor.SCAN_DUPLICATES = constructor.SCAN_DUPLICATES || false;
-
-    constructor.is = constructor.is || function(peripheral) {
-      return true;
-    };
-
-    constructor.emitter = new EventEmitter();
-
-    constructor.onDiscover = function(peripheral) {
-      if (constructor.is(peripheral)) {
-        var device = new constructor(peripheral);
-
-        constructor.emitter.emit('discover', device);
-      }
-    };
-
-    constructor.onStateChange = function(state) {
-      if (state === 'poweredOn' && constructor.emitter.listeners('discover').length > 0) {
-        constructor.startScanning();
-      }
-    };
-
-    constructor.startScanning = function() {
-      noble.startScanning(constructor.SCAN_UUIDS, constructor.SCAN_DUPLICATES);
-    };
-
-    constructor.stopScanning = function() {
-      noble.stopScanning();
-    };
-
-    constructor.discoverAll = function(callback) {
-      constructor.emitter.addListener('discover', callback);
-
-      if (constructor.emitter.listeners('discover').length === 1) {
-        noble.on('discover', constructor.onDiscover);
-        noble.on('stateChange', constructor.onStateChange);
-
-        if (noble.state === 'poweredOn') {
-          constructor.startScanning();
-        }
-      }
-    };
-
-    constructor.stopDiscoverAll = function(discoverCallback) {
-      constructor.emitter.removeListener('discover', discoverCallback);
-
-      if (constructor.emitter.listeners('discover').length === 0) {
-        noble.removeListener('discover', constructor.onDiscover);
-        noble.removeListener('stateChange', constructor.onStateChange);
-
-        constructor.stopScanning();
-      }
-    };
-
-    constructor.discover = function(callback) {
-      var onDiscover = function(device) {
-        constructor.stopDiscoverAll(onDiscover);
-
-        callback(device);
-      };
-
-      callback._nobleDeviceOnDiscover = onDiscover;
-
-      constructor.discoverAll(onDiscover);
-    };
-
-    constructor.stopDiscover = function(callback) {
-      var onDiscover = callback._nobleDeviceOnDiscover;
-
-      if (onDiscover) {
-        constructor.stopDiscoverAll(onDiscover);
-      }
-    };
-
-    constructor.discoverWithFilter = function(filter, callback) {
-      var onDiscoverWithFilter = function(device) {
-        if (filter(device)) {
-          constructor.stopDiscoverAll(onDiscoverWithFilter);
-
-          callback(device);
-        }
-      };
-
-      constructor.discoverAll(onDiscoverWithFilter);
-    };
-
-    constructor.discoverById = function(id, callback) {
-      constructor.discoverWithFilter(function(device) {
-        return (device.id === id);
-      }, callback);
-    };
-
-    // deprecated
-    constructor.discoverByUuid = function(uuid, callback) {
-      constructor.discoverWithFilter(function(device) {
-        return (device.uuid === uuid);
-      }, callback);
-    };
-
-    constructor.discoverByAddress = function(address, callback) {
-      constructor.discoverWithFilter(function(device) {
-        return (device.address === address);
-      }, callback);
-    };
+Util.inherits = function inherits(subClass, superClass) {
+  if (typeof superClass !== 'function' && superClass !== null) {
+    throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass);
   }
+  subClass.prototype = Object.create(superClass && superClass.prototype, {
+    constructor: { value: subClass, enumerable: false, writable: true, configurable: true }
+  });
+  if (superClass) Object.setPrototypeOf(subClass, superClass);
 };
 
 Util.mixin = function(constructor, mixin, includedMethods, excludedMethods) {