diff --git a/curl_cffi/requests/impersonate.py b/curl_cffi/requests/impersonate.py
index 27c473b..1a88b56 100644
--- a/curl_cffi/requests/impersonate.py
+++ b/curl_cffi/requests/impersonate.py
@@ -35,24 +35,24 @@
     "chrome_android",
 ]
 
-DefaultChrome = "chrome124"
-DefaultEdge = "edge101"
-DefaultSafari = "safari17_0"
-DefaultSafariPhone = "safari17_2_ios"
-DefaultChromePhone = "chrome99_android"
+DEFAULT_CHROME = "chrome124"
+DEFAULT_EDGE = "edge101"
+DEFAULT_SAFARI = "safari17_0"
+DEFAULT_SAFARI_IOS = "safari17_2_ios"
+DEFAULT_CHROME_ANDROID = "chrome99_android"
 
 
 def normalize_browser_type(item):
     if item == "chrome":  # noqa: SIM116
-        return DefaultChrome
+        return DEFAULT_CHROME
     elif item == "edge":
-        return DefaultEdge
+        return DEFAULT_EDGE
     elif item == "safari":
-        return DefaultSafari
+        return DEFAULT_SAFARI
     elif item == "safari_ios":
-        return DefaultSafariPhone
+        return DEFAULT_SAFARI_IOS
     elif item == "chrome_android":
-        return DefaultChromePhone
+        return DEFAULT_CHROME_ANDROID
     else:
         return item
 
diff --git a/curl_cffi/requests/session.py b/curl_cffi/requests/session.py
index 3e7eacd..18f0e76 100644
--- a/curl_cffi/requests/session.py
+++ b/curl_cffi/requests/session.py
@@ -35,6 +35,7 @@
     TLS_CIPHER_NAME_MAP,
     TLS_EC_CURVES_MAP,
     TLS_VERSION_MAP,
+    BrowserType,  # noqa: F401
     BrowserTypeLiteral,
     ExtraFingerprints,
     ExtraFpDict,