diff --git a/README.md b/README.md
index 91c3ef4..0d875b7 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,9 @@
 <img style="border-radius: 5px" src="https://raw.githubusercontent.com/Briuor/wbm/master/assets/demo.gif">
 </p>
 
+## Note
+**wbm** is an **unofficial** solution. It's not recommended using **wbm** in your company or for marketing purpose.
+
 ## Installation
 ```bash
 > npm install wbm
@@ -87,6 +90,7 @@ wbm.start().then(async () => {
 	Type: `boolean`<br />
 	* **session**<br />
 	Keep user session, so the user must scan the QR Code once.<br />
+    If you already is authenticated and **wbm** is asking for QR Code, please run using **session: false** once to reset your session. Then you use **session: true** again.<br />
 	Default: `true`<br />
 	Type: `boolean`
 
@@ -162,10 +166,6 @@ wbm.start().then(async () => {
 ### end()
 This method must be used at the end of wbm.start() to finish the browser.
 
-
-## Note
-**wbm** is an **unofficial** solution. It's not recommended using **wbm** in your company or for marketing purpose.
-
 ## Contributing
 
 Feel free to create pull requests. For major changes, please open an issue first to discuss what you would like to change.
diff --git a/test.js b/example.js
similarity index 100%
rename from test.js
rename to example.js
diff --git a/package-lock.json b/package-lock.json
index f9c1c28..38824e1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "wbm",
-  "version": "1.1.14",
+  "version": "1.1.15",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 2d73870..2d1ae1e 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   },
   "name": "wbm",
   "description": "wbm is an API to send bulk messages in whatsapp.",
-  "version": "1.1.14",
+  "version": "1.1.15",
   "main": "src/index.js",
   "devDependencies": {},
   "repository": {
diff --git a/src/api.js b/src/api.js
index ea3604d..e302ecc 100644
--- a/src/api.js
+++ b/src/api.js
@@ -10,6 +10,15 @@ let page = null;
 let counter = { fails: 0, success: 0 }
 const tmpPath = path.resolve(__dirname, '../tmp');
 
+const SELECTORS = {
+    LOADING: "progress",
+    INSIDE_CHAT: "document.getElementsByClassName('two')[0]",
+    QRCODE_PAGE: "body > div > div > .landing-wrapper",
+    QRCODE_DATA: "div[data-ref]",
+    QRCODE_DATA_ATTR: "data-ref",
+    SEND_BUTTON: 'div:nth-child(3) > button > span[data-icon="send"]'
+};
+
 /**
  * Initialize browser, page and setup page desktop mode
  */
@@ -68,7 +77,7 @@ function isAuthenticated() {
 function needsToScan() {
     return from(
         page
-            .waitForSelector('body > div > div > .landing-wrapper', {
+            .waitForSelector(SELECTORS.QRCODE_PAGE, {
                 timeout: 0,
             }).then(() => false)
     );
@@ -77,7 +86,7 @@ function needsToScan() {
 function isInsideChat() {
     return from(
         page
-            .waitForFunction(`document.getElementsByClassName('two')[0]`,
+            .waitForFunction(SELECTORS.INSIDE_CHAT,
                 {
                     timeout: 0,
                 }).then(() => true)
@@ -91,11 +100,11 @@ function deleteSession() {
  * return the data used to create the QR Code
  */
 async function getQRCodeData() {
-    await page.waitForSelector("div[data-ref]", { timeout: 60000 });
-    const qrcodeData = await page.evaluate(() => {
-        let qrcodeDiv = document.querySelector("div[data-ref]");
-        return qrcodeDiv.getAttribute("data-ref");
-    });
+    await page.waitForSelector(SELECTORS.QRCODE_DATA, { timeout: 60000 });
+    const qrcodeData = await page.evaluate((SELECTORS) => {
+        let qrcodeDiv = document.querySelector(SELECTORS.QRCODE_DATA);
+        return qrcodeDiv.getAttribute(SELECTORS.QRCODE_DATA_ATTR);
+    }, SELECTORS);
     return await qrcodeData;
 }
 
@@ -120,7 +129,7 @@ async function generateQRCode() {
 async function waitQRCode() {
     // if user scan QR Code it will be hidden
     try {
-        await page.waitForSelector("div[data-ref]", { timeout: 30000, hidden: true });
+        await page.waitForSelector(SELECTORS.QRCODE_PAGE, { timeout: 30000, hidden: true });
     } catch (err) {
         throw await QRCodeExeption("Dont't be late to scan the QR Code.");
     }
@@ -149,8 +158,8 @@ async function sendTo(phoneOrContact, message) {
     try {
         process.stdout.write("Sending Message...\r");
         await page.goto(`https://web.whatsapp.com/send?phone=${phone}&text=${encodeURIComponent(message)}`);
-        await page.waitForSelector("div#startup", { hidden: true, timeout: 60000 });
-        await page.waitForSelector('#main > footer > div.vR1LG._3wXwX.copyable-area > div._2A8P4 > div > div._2_1wd.copyable-text.selectable-text', { timeout: 5000 });
+        await page.waitForSelector(SELECTORS.LOADING, { hidden: true, timeout: 60000 });
+        await page.waitForSelector(SELECTORS.SEND_BUTTON, { timeout: 5000 });
         await page.keyboard.press("Enter");
         await page.waitFor(1000);
         process.stdout.clearLine();