diff --git a/mvt/android/cli.py b/mvt/android/cli.py
index 945277f..a291539 100644
--- a/mvt/android/cli.py
+++ b/mvt/android/cli.py
@@ -28,7 +28,7 @@ log = logging.getLogger(__name__)
 
 # Help messages of repeating options.
 OUTPUT_HELP_MESSAGE = "Specify a path to a folder where you want to store JSON results"
-
+SERIAL_HELP_MESSAGE = "Specify a device serial number or HOST:PORT connection string"
 
 #==============================================================================
 # Main
@@ -42,6 +42,7 @@ def cli():
 # Download APKs
 #==============================================================================
 @cli.command("download-apks", help="Download all or non-safelisted installed APKs installed on the device")
+@click.option("--serial", "-s", type=str, help=SERIAL_HELP_MESSAGE)
 @click.option("--all-apks", "-a", is_flag=True,
               help="Extract all packages installed on the phone, even those marked as safe")
 @click.option("--virustotal", "-v", is_flag=True, help="Check packages on VirusTotal")
@@ -51,7 +52,6 @@ def cli():
               help="Specify a path to a folder where you want to store the APKs")
 @click.option("--from-file", "-f", type=click.Path(exists=True),
               help="Instead of acquiring from phone, load an existing packages.json file for lookups (mainly for debug purposes)")
-@click.option("--serial", "-s", type=str, help="Use the Android device with a given serial number")
 def download_apks(all_apks, virustotal, koodous, all_checks, output, from_file, serial):
     try:
         if from_file:
@@ -64,7 +64,9 @@ def download_apks(all_apks, virustotal, koodous, all_checks, output, from_file,
                     log.critical("Unable to create output folder %s: %s", output, e)
                     sys.exit(-1)
 
-            download = DownloadAPKs(output_folder=output, all_apks=all_apks, serial=serial)
+            download = DownloadAPKs(output_folder=output, all_apks=all_apks)
+            if serial:
+                download.serial = serial
             download.run()
 
         packages = download.packages
@@ -86,12 +88,12 @@ def download_apks(all_apks, virustotal, koodous, all_checks, output, from_file,
 # Checks through ADB
 #==============================================================================
 @cli.command("check-adb", help="Check an Android device over adb")
+@click.option("--serial", "-s", type=str, help=SERIAL_HELP_MESSAGE)
 @click.option("--iocs", "-i", type=click.Path(exists=True), help="Path to indicators file")
 @click.option("--output", "-o", type=click.Path(exists=False),
               help="Specify a path to a folder where you want to store JSON results")
 @click.option("--list-modules", "-l", is_flag=True, help="Print list of available modules and exit")
 @click.option("--module", "-m", help="Name of a single module you would like to run instead of all")
-@click.option("--serial", "-s", type=str, help="Use the Android device with a given serial")
 def check_adb(iocs, output, list_modules, module, serial):
     if list_modules:
         log.info("Following is the list of available check-adb modules:")
@@ -120,7 +122,9 @@ def check_adb(iocs, output, list_modules, module, serial):
         if module and adb_module.__name__ != module:
             continue
 
-        m = adb_module(output_folder=output, serial=serial, log=logging.getLogger(adb_module.__module__))
+        m = adb_module(output_folder=output, log=logging.getLogger(adb_module.__module__))
+        if serial:
+            m.serial = serial
 
         if iocs:
             indicators.log = m.log
@@ -140,9 +144,9 @@ def check_adb(iocs, output, list_modules, module, serial):
 # Check ADB backup
 #==============================================================================
 @cli.command("check-backup", help="Check an Android Backup")
+@click.option("--serial", "-s", type=str, help=SERIAL_HELP_MESSAGE)
 @click.option("--iocs", "-i", type=click.Path(exists=True), help="Path to indicators file")
 @click.option("--output", "-o", type=click.Path(exists=False), help=OUTPUT_HELP_MESSAGE)
-@click.option("--serial", "-s", type=str, help="Use the Android device with a given serial")
 @click.argument("BACKUP_PATH", type=click.Path(exists=True))
 def check_backup(iocs, output, backup_path, serial):
     log.info("Checking ADB backup located at: %s", backup_path)
@@ -169,7 +173,10 @@ def check_backup(iocs, output, backup_path, serial):
 
     for module in BACKUP_MODULES:
         m = module(base_folder=backup_path, output_folder=output,
-                   serial=serial, log=logging.getLogger(module.__module__))
+                   log=logging.getLogger(module.__module__))
+
+        if serial:
+            m.serial = serial
 
         if iocs:
             indicators.log = m.log
diff --git a/mvt/android/download_apks.py b/mvt/android/download_apks.py
index 3ac03c2..8cfe6b8 100644
--- a/mvt/android/download_apks.py
+++ b/mvt/android/download_apks.py
@@ -40,16 +40,11 @@ class DownloadAPKs(AndroidExtraction):
     """DownloadAPKs is the main class operating the download of APKs
     from the device."""
 
-    def __init__(self, output_folder=None, all_apks=False, packages=None, serial=None):
-        """Initialize module.
-        :param output_folder: Path to the folder where data should be stored
-        :param all_apks: Boolean indicating whether to download all packages
-                         or filter known-goods
-        :param packages: Provided list of packages, typically for JSON checks
-        :param serial: The USB device serial ID
-        """
-        super().__init__(file_path=None, base_folder=None,
-                         output_folder=output_folder, serial=serial)
+    def __init__(self, file_path=None, base_folder=None, output_folder=None,
+                 serial=None, fast_mode=False, log=None, results=[]):
+        super().__init__(file_path=file_path, base_folder=base_folder,
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
         self.output_folder_apk = None
         self.packages = packages or []
diff --git a/mvt/android/modules/adb/base.py b/mvt/android/modules/adb/base.py
index 338445e..71832e5 100644
--- a/mvt/android/modules/adb/base.py
+++ b/mvt/android/modules/adb/base.py
@@ -27,19 +27,19 @@ class AndroidExtraction(MVTModule):
     """This class provides a base for all Android extraction modules."""
 
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
-                 serial=None, fast_mode=False, log=None, results=[]):
+                 fast_mode=False, log=None, results=[]):
         """Initialize Android extraction module.
         :param file_path: Path to the database file to parse
         :param base_folder: Path to a base folder containing an Android dump
         :param output_folder: Path to the folder where to store extraction
                               results
-        :param serial: The USB device serial ID
         """
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
         self.device = None
+        self.serial = None
 
     def _adb_check_keys(self):
         """Make sure Android adb keys exist.
@@ -60,15 +60,18 @@ class AndroidExtraction(MVTModule):
 
         signer = PythonRSASigner("", priv_key)
 
-        if self.serial is None or ":" not in self.serial:
+        # If no serial was specified or if the serial does not seem to be
+        # a HOST:PORT definition, we use the USB transport.
+        if not self.serial or ":" not in self.serial:
             self.device = AdbDeviceUsb(serial=self.serial)
+        # Otherwise we try to use the TCP transport.
         else:
             addr = self.serial.split(":")
-
             if len(addr) < 2:
                 raise ValueError("TCP serial number must follow the format: `address:port`")
 
-            self.device = AdbDeviceTcp(addr[0], int(addr[1]), default_transport_timeout_s=9.)
+            self.device = AdbDeviceTcp(addr[0], int(addr[1]),
+                                       default_transport_timeout_s=30.)
 
         while True:
             try:
diff --git a/mvt/android/modules/adb/chrome_history.py b/mvt/android/modules/adb/chrome_history.py
index a09a27b..f163147 100644
--- a/mvt/android/modules/adb/chrome_history.py
+++ b/mvt/android/modules/adb/chrome_history.py
@@ -22,8 +22,8 @@ class ChromeHistory(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def serialize(self, record):
         return {
diff --git a/mvt/android/modules/adb/dumpsys_batterystats.py b/mvt/android/modules/adb/dumpsys_batterystats.py
index 8e66180..b804c2f 100644
--- a/mvt/android/modules/adb/dumpsys_batterystats.py
+++ b/mvt/android/modules/adb/dumpsys_batterystats.py
@@ -16,8 +16,8 @@ class DumpsysBatterystats(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def run(self):
         self._adb_connect()
diff --git a/mvt/android/modules/adb/dumpsys_packages.py b/mvt/android/modules/adb/dumpsys_packages.py
index a6cd1fe..3e87769 100644
--- a/mvt/android/modules/adb/dumpsys_packages.py
+++ b/mvt/android/modules/adb/dumpsys_packages.py
@@ -16,8 +16,8 @@ class DumpsysPackages(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def run(self):
         self._adb_connect()
diff --git a/mvt/android/modules/adb/dumpsys_procstats.py b/mvt/android/modules/adb/dumpsys_procstats.py
index 2a5c203..a2a69c7 100644
--- a/mvt/android/modules/adb/dumpsys_procstats.py
+++ b/mvt/android/modules/adb/dumpsys_procstats.py
@@ -16,8 +16,8 @@ class DumpsysProcstats(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def run(self):
         self._adb_connect()
diff --git a/mvt/android/modules/adb/packages.py b/mvt/android/modules/adb/packages.py
index 09cc7a0..54d1158 100644
--- a/mvt/android/modules/adb/packages.py
+++ b/mvt/android/modules/adb/packages.py
@@ -18,8 +18,8 @@ class Packages(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def serialize(self, record):
         records = []
diff --git a/mvt/android/modules/adb/processes.py b/mvt/android/modules/adb/processes.py
index 2f4dbf8..6350416 100644
--- a/mvt/android/modules/adb/processes.py
+++ b/mvt/android/modules/adb/processes.py
@@ -15,8 +15,8 @@ class Processes(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def run(self):
         self._adb_connect()
diff --git a/mvt/android/modules/adb/rootbinaries.py b/mvt/android/modules/adb/rootbinaries.py
index c6ff128..65e45dd 100644
--- a/mvt/android/modules/adb/rootbinaries.py
+++ b/mvt/android/modules/adb/rootbinaries.py
@@ -18,8 +18,8 @@ class RootBinaries(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def run(self):
         root_binaries_path = os.path.join("..", "..", "data", "root_binaries.txt")
diff --git a/mvt/android/modules/adb/sms.py b/mvt/android/modules/adb/sms.py
index d384833..5db5652 100644
--- a/mvt/android/modules/adb/sms.py
+++ b/mvt/android/modules/adb/sms.py
@@ -45,8 +45,8 @@ class SMS(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def serialize(self, record):
         text = record["text"].replace("\n", "\\n")
diff --git a/mvt/android/modules/adb/whatsapp.py b/mvt/android/modules/adb/whatsapp.py
index 28d7518..7a8fe37 100644
--- a/mvt/android/modules/adb/whatsapp.py
+++ b/mvt/android/modules/adb/whatsapp.py
@@ -22,8 +22,8 @@ class Whatsapp(AndroidExtraction):
     def __init__(self, file_path=None, base_folder=None, output_folder=None,
                  serial=None, fast_mode=False, log=None, results=[]):
         super().__init__(file_path=file_path, base_folder=base_folder,
-                         output_folder=output_folder, serial=serial,
-                         fast_mode=fast_mode, log=log, results=results)
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
 
     def serialize(self, record):
         text = record["data"].replace("\n", "\\n")