diff --git a/IsegHVController.py b/IsegHVController.py
index 98284a4..79912f3 100755
--- a/IsegHVController.py
+++ b/IsegHVController.py
@@ -5,6 +5,7 @@ import os
 import datetime
 import csv
 import socket
+import sys
 
 #assign a port, to prevent the script run mulitple time
 s = socket.socket()
@@ -12,12 +13,19 @@ host = socket.gethostname()
 port = 4305
 s.bind((host,port))
 
-IP = input('Mpod IP address to connect : ')
+nArg = len(sys.argv)
+
+print ( nArg)
+
+if nArg > 1 :
+  IP = sys.argv[1]
+else :
+  IP = input('Mpod IP address to connect : ')
 
 #===================== GUI
 import PySimpleGUI as sg
 
-#gui.theme('DarkAmber')
+sg.theme('DarkPurple5')
 
 header = ["name", "HV [V]", "Current [mA]"]
 
@@ -26,6 +34,7 @@ mpod = iseg.Mpod(IP)
 if mpod.isConnected == False:
   exit()
 
+
 chList = mpod.GetChList()
 hvList = mpod.GetAllHV()    # get all V
 iList = mpod.GetAllCurrent() # get all current
diff --git a/IsegLibrary.py b/IsegLibrary.py
index b64a423..66e1ecd 100755
--- a/IsegLibrary.py
+++ b/IsegLibrary.py
@@ -18,6 +18,9 @@ class Mpod:
     except :
       print("cannot establish communitation via " + self.IP)
     
+  def SetIP(self, ip):
+    self.__init__(ip)
+    
   def SendCmd(self, option,cmd):
     if (self.isConnected == False ) : return 0
     if option == 0 :
diff --git a/README.md b/README.md
index 3b3cdad..0b2accc 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,11 @@
-request packages
+# Request packages
 
-sudo apt install python3-tk snmp snmp-mibs-downloader
+in Ubuntu 20+
+
+>sudo apt install python3-tk snmp snmp-mibs-downloader
+>python3 -m pip install pysimplegui
+
+# Usage
+
+>python3 IsegHVController.py <IP>
 
-python3 -m pip install pysimplegui