diff --git a/printer.py b/printer.py
index 872d655..5f704f8 100644
--- a/printer.py
+++ b/printer.py
@@ -1,13 +1,32 @@
 from trytond.model import Model, ModelSQL, ModelView, fields
+from trytond.pyson import Eval
 
 
 
 class Device(Model):
     'Devices'
     __name__ = 'sale_device'
+
     name = fields.Char("Name")
-    ip_address = fields.Char('IP Address or Network', help='IPv4 or IPv6 IP address or network. Valid values include: 192.168.0.26 or 192.168.0.0/24')
-        
+    type_ = fields.Selection([('usb', "Usb"),
+                              ('network', "Network")], "Type")    
+    ip_address = fields.Char('IP Address or Network',
+                             states={'required': Eval('type_') == 'network',
+                                     'invisible': Eval('type_') != 'network'},
+                             help='IPv4 or IPv6 IP address or network. Valid values include: 192.168.0.26 or 192.168.0.0/24')
+    idVendor = fields.Char('idVendor', states={
+        'required': Eval('type_') == 'usb',
+        'invisible': Eval('type_') != 'usb',
+    })
+    idProduct = fields.Char('idProduct', states={
+        'required': Eval('type_') == 'usb',
+        'invisible': Eval('type_') != 'usb',
+    })
+
+    @classmethod
+    def default_type(cls):
+        return 'network'
+    
 class Printer(Device, ModelSQL, ModelView):
     'Printer'
     __name__ = 'sale.printer'
diff --git a/view/printer_form.xml b/view/printer_form.xml
index 6fa4c32..603d4ad 100644
--- a/view/printer_form.xml
+++ b/view/printer_form.xml
@@ -4,12 +4,18 @@
 <form>
   <label name="name"/>
   <field name="name"/>
-  <label name="ip_address"/>
-  <field name="ip_address"/>
   <label name="api"/>
   <field name="api"/>
-  <label name="zone"/>
-  <field name="zone"/>
   <label name="shop"/>
   <field name="shop"/>
+  <label name="zone"/>
+  <field name="zone"/>
+  <label name="type_"/>
+  <field name="type_"/>
+  <label name="ip_address"/>
+  <field name="ip_address"/>
+  <label name="idVendor"/>
+  <field name="idVendor"/>
+  <label name="idProduct"/>
+  <field name="idProduct"/>
 </form>
diff --git a/view/printer_tree.xml b/view/printer_tree.xml
index 8c2893b..a990ff9 100644
--- a/view/printer_tree.xml
+++ b/view/printer_tree.xml
@@ -2,6 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
      this repository contains the full copyright notices and license terms. -->
 <tree>
-  <field name="name"/>
-  <field name="ip_address"/>
+    <field name="name"/>
+    <field name="type_"/>
+    <field name="ip_address"/>
 </tree>