diff --git a/ItemTracked.js b/ItemTracked.js
index 7fc87f4..dcc54d7 100644
--- a/ItemTracked.js
+++ b/ItemTracked.js
@@ -15,25 +15,17 @@ var computeVelocityVector = require('./utils').computeVelocityVector
 // Use a simple incremental unique id for the display
 var idDisplay = 0;
 
-// Default Params
-const params = {
-  // Remove new objects fast if they could not be matched in the next frames.
-  // Setting this to false ensures the object will stick around at least
-  // DEFAULT_UNMATCHEDFRAMES_TOLERANCE frames, even if they could neven be
-  // matched in subsequent frames.
-  fastDelete: true
-}
-
-exports.ItemTracked = function(properties, frameNb, DEFAULT_UNMATCHEDFRAMES_TOLERANCE){
-  var DEFAULT_UNMATCHEDFRAMES_TOLERANCE = DEFAULT_UNMATCHEDFRAMES_TOLERANCE;
+exports.ItemTracked = function(properties, frameNb, unMatchedFramesTolerance, fastDelete){
+  var DEFAULT_UNMATCHEDFRAMES_TOLERANCE = unMatchedFramesTolerance;
   var itemTracked = {};
   // ==== Private =====
   // Am I available to be matched?
   itemTracked.available = true;
   // Should I be deleted?
   itemTracked.delete = false;
+  itemTracked.fastDelete = fastDelete;
   // How many unmatched frame should I survive?
-  itemTracked.frameUnmatchedLeftBeforeDying = DEFAULT_UNMATCHEDFRAMES_TOLERANCE;
+  itemTracked.frameUnmatchedLeftBeforeDying = unMatchedFramesTolerance;
   itemTracked.isZombie = false;
   itemTracked.appearFrame = frameNb;
   itemTracked.disappearFrame = null;
@@ -120,7 +112,7 @@ exports.ItemTracked = function(properties, frameNb, DEFAULT_UNMATCHEDFRAMES_TOLE
     this.frameUnmatchedLeftBeforeDying--;
     this.isZombie = true;
     // If it was matched less than 1 time, it should die quick
-    if(params.fastDelete && this.nbTimeMatched <= 1) {
+    if(this.fastDelete && this.nbTimeMatched <= 1) {
       this.frameUnmatchedLeftBeforeDying = -1;
     }
   }
diff --git a/spec/Tracker.spec.js b/spec/Tracker.spec.js
index 8e363f3..525c333 100644
--- a/spec/Tracker.spec.js
+++ b/spec/Tracker.spec.js
@@ -48,9 +48,7 @@ describe('Tracker', function () {
   beforeEach(function () {
     Tracker.reset();
     Tracker.setParams({
-      items: {
-        fastDelete: true
-      },
+      fastDelete: true,
       unMatchedFramesTolerance: 5,
       iouLimit: 0.05
     });
@@ -76,7 +74,7 @@ describe('Tracker', function () {
     });
 
     it('keeps the item if fastDelete is disabled', function () {
-      Tracker.setParams({ items: { fastDelete: false } });
+      Tracker.setParams({ fastDelete: false });
       Tracker.reset();
 
       detections.forEach((frame, frameNb) => {
diff --git a/tracker.js b/tracker.js
index 23f5cf1..051f554 100644
--- a/tracker.js
+++ b/tracker.js
@@ -6,12 +6,19 @@ var iouAreas = require('./utils').iouAreas
 
 var DEBUG_MODE = false;
 
-// DEFAULT_UNMATCHEDFRAMES_TOLERANCE
-// This the number of frame we wait when an object isn't matched before considering it gone
-var DEFAULT_UNMATCHEDFRAMES_TOLERANCE = 5;
-// IOU_LIMIT, exclude things from beeing matched if their IOU is lower than this
-// 1 means total overlap whereas 0 means no overlap
-var IOU_LIMIT = 0.05
+const params = {
+  // DEFAULT_UNMATCHEDFRAMES_TOLERANCE
+  // This the number of frame we wait when an object isn't matched before considering it gone
+  unMatchedFramesTolerance: 5,
+  // DEFAULT_IOU_LIMIT, exclude things from beeing matched if their IOU is lower than this
+  // 1 means total overlap whereas 0 means no overlap
+  iouLimit: 0.05,
+  // Remove new objects fast if they could not be matched in the next frames.
+  // Setting this to false ensures the object will stick around at least
+  // unMatchedFramesTolerance frames, even if they could neven be matched in
+  // subsequent frames.
+  fastDelete: true
+}
 
 // A dictionary of itemTracked currently tracked
 // key: uuid
@@ -40,7 +47,7 @@ const computeDistance = function(item1, item2) {
   var distance = 1 - iou;
 
   // If the overlap is iou < 0.95, exclude value
-  if(distance > (1 - IOU_LIMIT)) {
+  if(distance > (1 - params.iouLimit)) {
     distance = KDTREESEARCH_LIMIT + 1;
   }
 
@@ -62,7 +69,7 @@ exports.updateTrackedItemsWithNewFrame = function(detectionsOfThisFrame, frameNb
   if(mapOfItemsTracked.size === 0) {
     // Just add every detected item as item Tracked
     detectionsOfThisFrame.forEach(function(itemDetected) {
-      var newItemTracked = new ItemTracked(itemDetected, frameNb, DEFAULT_UNMATCHEDFRAMES_TOLERANCE)
+      var newItemTracked = new ItemTracked(itemDetected, frameNb, params.unMatchedFramesTolerance, params.fastDelete)
       // Add it to the map
       mapOfItemsTracked.set(newItemTracked.id, newItemTracked)
       // Add it to the kd tree
@@ -189,7 +196,7 @@ exports.updateTrackedItemsWithNewFrame = function(detectionsOfThisFrame, frameNb
           var treeSearchResult = treeItemsTracked.nearest(detectionsOfThisFrame[index], 1, KDTREESEARCH_LIMIT)[0];
 
           if(!treeSearchResult) {
-            var newItemTracked = ItemTracked(detectionsOfThisFrame[index], frameNb, DEFAULT_UNMATCHEDFRAMES_TOLERANCE)
+            var newItemTracked = ItemTracked(detectionsOfThisFrame[index], frameNb, params.unMatchedFramesTolerance, params.fastDelete)
             // Add it to the map
             mapOfItemsTracked.set(newItemTracked.id, newItemTracked)
             // Add it to the kd tree
@@ -228,18 +235,10 @@ exports.reset = function() {
   itemTrackedModule.reset();
 }
 
-exports.setParams = function(params) {
-  if(params.unMatchedFramesTolerance) {
-    DEFAULT_UNMATCHEDFRAMES_TOLERANCE = params.unMatchedFramesTolerance;
-  }
-  if(params.iouLimit) {
-    IOU_LIMIT = params.iouLimit;
-  }
-
-  // To keep the API simple, we just move the params down to the ItemsTracked as well.
-  if("items" in params) {
-    itemTrackedModule.setParams(params.items);
-  }
+exports.setParams = function(newParams) {
+  Object.keys(newParams).forEach((key) => {
+    params[key] = newParams[key];
+  });
 }
 
 exports.enableKeepInMemory = function() {