diff --git a/locale/es.po b/locale/es.po
index 5217661..5503784 100644
--- a/locale/es.po
+++ b/locale/es.po
@@ -7,6 +7,18 @@ msgctxt "field:sale.printer,name:"
 msgid "Name"
 msgstr "Nombre"
 
+msgctxt "field:sale.printer,type_:"
+msgid "Type"
+msgstr "Tipo"
+
+msgctxt "selection:sale.printer,type_:"
+msgid "USB"
+msgstr "USB"
+
+msgctxt "selection:sale.printer,type_:"
+msgid "Network"
+msgstr "Red"
+
 msgctxt "field:sale.printer,ip_address:"
 msgid "IP Address or Network"
 msgstr "Dirección IP"
diff --git a/printer.py b/printer.py
index 5f704f8..c670273 100644
--- a/printer.py
+++ b/printer.py
@@ -2,18 +2,20 @@ from trytond.model import Model, ModelSQL, ModelView, fields
 from trytond.pyson import Eval
 
 
-
 class Device(Model):
     'Devices'
     __name__ = 'sale_device'
 
     name = fields.Char("Name")
-    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')
+    type_ = fields.Selection([
+        ('usb', "USB"),
+        ('network', "Network")], "Type")
+    ip_address = fields.Char(
+        'IP Address or Network',
+        states={'required': Eval('type_') == 'network',
+                'invisible': Eval('type_') == 'usb'},
+        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',
@@ -24,9 +26,10 @@ class Device(Model):
     })
 
     @classmethod
-    def default_type(cls):
+    def default_type_(cls):
         return 'network'
-    
+
+
 class Printer(Device, ModelSQL, ModelView):
     'Printer'
     __name__ = 'sale.printer'
@@ -36,8 +39,8 @@ class Printer(Device, ModelSQL, ModelView):
                              ('reception', "Reception")], "Zone")
     shop = fields.Many2One('sale.shop', "Shop")
     api = fields.Many2One('sale.printer_api', "API")
-    
+
+
 class Api(Device, ModelSQL, ModelView):
     'Api printer'
     __name__ = 'sale.printer_api'
-
diff --git a/shop.py b/shop.py
index a5574de..ed17848 100644
--- a/shop.py
+++ b/shop.py
@@ -1,8 +1,9 @@
-from trytond.model import Model, ModelSQL, ModelView, fields
-from trytond.pool import Pool, PoolMeta
+from trytond.model import fields
+from trytond.pool import PoolMeta
+
 
 class Shop(metaclass=PoolMeta):
     "Shop"
     __name__ = 'sale.shop'
-    
+
     printers = fields.One2Many('sale.printer', 'shop', "Printers")
diff --git a/shop.xml b/shop.xml
index 7820e24..91ee1f2 100644
--- a/shop.xml
+++ b/shop.xml
@@ -8,10 +8,5 @@ this repository contains the full copyright notices and license terms. -->
             <field name="inherit" ref="sale_shop.sale_shop_view_form"/>
             <field name="name">shop_form</field>
         </record>
-        <record model="ir.ui.view" id="sale_shop_view_tree">
-            <field name="model">sale.device</field>
-            <field name="inherit" ref="sale_shop.sale_shop_view_tree"/>
-            <field name="name">shop_tree</field>
-        </record>
     </data>
 </tryton>
diff --git a/view/api_form.xml b/view/api_form.xml
index ba392dd..894363b 100644
--- a/view/api_form.xml
+++ b/view/api_form.xml
@@ -4,6 +4,8 @@
 <form>
   <label name="name"/>
   <field name="name"/>
+  <label name="type_"/>
+  <field name="type_"/>
   <label name="ip_address"/>
   <field name="ip_address"/>
 </form>
diff --git a/view/api_tree.xml b/view/api_tree.xml
index 8c2893b..a990ff9 100644
--- a/view/api_tree.xml
+++ b/view/api_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>
diff --git a/view/printer_tree.xml b/view/printer_tree.xml
index a990ff9..27bd2af 100644
--- a/view/printer_tree.xml
+++ b/view/printer_tree.xml
@@ -3,6 +3,9 @@
      this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="name"/>
+    <field name="shop"/>
     <field name="type_"/>
     <field name="ip_address"/>
+    <field name="idVendor"/>
+    <field name="idProduct"/>
 </tree>