diff --git a/README.md b/README.md
index cfedc33..e262de4 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ avoid having to re-sync.
 Requirements
 ------------
 
-- [openant >= 0.2](https://github.com/Tigge/openant)
+- [openant >= 0.3](https://github.com/Tigge/openant)
 
 Installation
 ------------
@@ -29,9 +29,15 @@ Usage
     Usage: antfs-cli [options]
 
     Options:
-      -h, --help  show this help message and exit
-      --upload    enable uploading
-      --debug     enable debug
+       -h, --help           show this help message and exit
+       --upload             enable uploading
+       -t, --time           send time to divice (for example to set its clock)
+       -e, --erase          delete monitoring_b files that have already been
+                            downloaded before
+       --ls                 print files stored on device
+       --debug              enable debug
+       --pair               force pairing even if already paired
+       -a, --skip-archived  don't download files marked as 'archived' on the watch
 
 
 File locations
@@ -74,5 +80,6 @@ have been reported as working:
  - Garmin Forerunner 910XT
  - Garmin FR70
  - Garmin Swim
+ - Garmin vivofit
 
 Please let me know if you have any success with devices that are not listed here.
diff --git a/antfs_cli/program.py b/antfs_cli/program.py
index d5b5fa2..ffa7839 100755
--- a/antfs_cli/program.py
+++ b/antfs_cli/program.py
@@ -137,6 +137,9 @@ def __init__(self, config_dir, args):
 
         self._device = None
         self._uploading = args.upload
+        self._time = args.time
+        self._erase = args.erase
+        self._ls = args.ls
         self._pair = args.pair
         self._skip_archived = args.skip_archived
 
@@ -189,8 +192,22 @@ def on_authentication(self, beacon):
                 return False
 
     def on_transport(self, beacon):
+        #transmit time so that devices can adjust their clocks
+        if self._time:
+            print("Transfer time to device")
+            try:
+                result = self.set_time()
+            except AntFSTimeException, e:
+                print("Could not set time %s", str(e))
+                _logger.debug("Could not set time")
+            else:
+                print("Time set")
+         
         directory = self.download_directory()
-        # directory.print_list()
+        
+        if self._ls:
+            print("Files on device:")
+            directory.print_list()
 
         # Map local filenames to FIT file types
         local_files = []
@@ -211,7 +228,10 @@ def on_transport(self, beacon):
         remote_names = set(name for (name, fil) in remote_files)
         downloading = [fil
                        for name, fil in remote_files
-                       if name not in local_names or not fil.is_archived()]
+                       if name not in local_names]
+        already_downloaded = [fil
+                              for name, fil in remote_files
+                              if name in local_names and fil.get_fit_sub_type() == File.Identifier.MONITORING_B]
         uploading = [(name, filetype)
                      for name, filetype in local_files
                      if name not in remote_names]
@@ -229,7 +249,13 @@ def on_transport(self, beacon):
         # Download missing files:
         for fileobject in downloading:
             self.download_file(fileobject)
-
+        
+        #delete file
+        if self._erase:
+	    print("Erase all files that were already present before downloading")
+            for fileobject in already_downloaded:
+                self.erase_file(fileobject)
+        
         # Upload missing files:
         if uploading and self._uploading:
             # Upload
@@ -262,6 +288,21 @@ def get_filepath(self, fil):
                             _filetypes[fil.get_fit_sub_type()],
                             self.get_filename(fil))
 
+    def erase_file(self, fil):
+        if not isinstance(fil, File):
+             print("fil not of type File")
+             return
+        sys.stdout.write("Erasing file {0}: ".format(self.get_filename(fil)))
+        sys.stdout.flush()
+        try:
+	    self.erase(fil.get_index())
+        except AntFSDownloadException, e:
+            sys.stdout.write("Could not erase file")
+        else:
+            sys.stdout.write("Done")
+        sys.stdout.write("\n")
+        sys.stdout.flush()
+
     def download_file(self, fil):
         sys.stdout.write("Downloading {0}: ".format(self.get_filename(fil)))
         sys.stdout.flush()
@@ -306,6 +347,9 @@ def callback(new_progress):
 def main():
     parser = ArgumentParser(description="Extracts FIT files from ANT-FS based sport watches.")
     parser.add_argument("--upload", action="store_true", help="enable uploading")
+    parser.add_argument("-t","--time", action="store_true", help="send time to divice (for example to set its clock)")
+    parser.add_argument("-e","--erase", action="store_true", help="delete monitoring_b files that have already been downloaded before")
+    parser.add_argument("--ls", action="store_true", help="print files stored on device")
     parser.add_argument("--debug", action="store_true", help="enable debug")
     parser.add_argument("--pair", action="store_true", help="force pairing even if already paired")
     parser.add_argument("-a", "--skip-archived", action="store_true", help="don't download files marked as 'archived' on the watch")
diff --git a/setup.py b/setup.py
index f17c0a8..35d8ace 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@
                    'Programming Language :: Python :: 3.3',
                    'Programming Language :: Python :: 3.4'],
 
-      dependency_links=['git+https://github.com/Tigge/openant.git#egg=openant-0.2'], 
-      install_requires=['openant>=0.2'],
+      dependency_links=['git+https://github.com/Tigge/openant.git#egg=openant-0.3'], 
+      install_requires=['openant>=0.3'],
 
       test_suite='tests')