diff --git a/utils/utils.py b/utils/utils.py
index c3c4a01..fbd0016 100644
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -11,6 +11,14 @@ from selenium import webdriver
 from selenium.webdriver.common.by import By
 from selenium.webdriver.support.ui import Select
 
+# Constants for configuration and element IDs
+EIP_URL = "https://eip.techmation.com.tw/MotorWeb/MotorFaceDefaultNew.aspx"
+LANG_DROPDOWN_ID = "ddlLang"
+LOGIN_ID_INPUT_ID = "txtLoginID"
+LOGIN_PWD_INPUT_ID = "txtLoginPwd"
+COMPANY_ID_DROPDOWN_ID = "ddlCompanyID"
+LOGIN_BUTTON_ID = "btnLogin"
+
 
 class LoginInfo():
     def __init__(self, config_path: WindowsPath):
@@ -37,8 +45,6 @@ class LoginInfo():
 
 
 def keep_login_status(driver: webdriver.Chrome, login_info: LoginInfo):
-    EIP_url = "https://eip.techmation.com.tw/MotorWeb/MotorFaceDefaultNew.aspx"
-
     # * Close all windows except the main window.
     while len(driver.window_handles) > 1:
         driver.switch_to.window(driver.window_handles[1])
@@ -47,29 +53,29 @@ def keep_login_status(driver: webdriver.Chrome, login_info: LoginInfo):
     driver.switch_to.window(driver.window_handles[0])
 
     top_page = driver.current_window_handle
-    driver.get(EIP_url)
+    driver.get(EIP_URL)
     time.sleep(0.3)
 
     if driver.title == "CHI MOTOR WEB ERP 登入":
         # * Fill in all login information.
-        dropdown_element = driver.find_element(By.ID, "ddlLang")
+        dropdown_element = driver.find_element(By.ID, LANG_DROPDOWN_ID)
         select = Select(dropdown_element)
         select.select_by_value(login_info.lang)
 
-        input_text_element = driver.find_element(By.ID, "txtLoginID")
+        input_text_element = driver.find_element(By.ID, LOGIN_ID_INPUT_ID)
         input_text_element.clear()
         input_text_element.send_keys(login_info.login_ID)
 
-        input_text_element = driver.find_element(By.ID, "txtLoginPwd")
+        input_text_element = driver.find_element(By.ID, LOGIN_PWD_INPUT_ID)
         input_text_element.clear()
         input_text_element.send_keys(login_info.login_passwd)
 
-        dropdown_element = driver.find_element(By.ID, "ddlCompanyID")
+        dropdown_element = driver.find_element(By.ID, COMPANY_ID_DROPDOWN_ID)
         select = Select(dropdown_element)
         select.select_by_value(login_info.company_ID)
 
         # * Press the submit button.
-        submit_btn = driver.find_element(By.ID, "btnLogin")
+        submit_btn = driver.find_element(By.ID, LOGIN_BUTTON_ID)
         submit_btn.click()
 
         time.sleep(3)