diff --git a/product_usability/models/product_product.py b/product_usability/models/product_product.py
index 79681a2..c0f219b 100644
--- a/product_usability/models/product_product.py
+++ b/product_usability/models/product_product.py
@@ -1,21 +1,21 @@
-# Copyright 2015-2020 Akretion (http://www.akretion.com)
+# Copyright 2015-2021 Akretion (http://www.akretion.com)
 # @author Alexis de Lattre <alexis.delattre@akretion.com>
 # @author Raphaël Valyi <rvalyi@akretion.com>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
-from odoo import models, fields
+from odoo import api, models, fields
 
 
 class ProductProduct(models.Model):
     _inherit = 'product.product'
 
-    default_code = fields.Char(copy=False)
-#        track_visibility='onchange',
-
-#    barcode = fields.Char(track_visibility='onchange',
-
-#    weight = fields.Float(track_visibility='onchange')
-#    active = fields.Boolean(track_visibility='onchange')
+    default_code = fields.Char(copy=False, tracking=10)
+    barcode = fields.Char(tracking=20)
+    weight = fields.Float(tracking=30)
+    active = fields.Boolean(tracking=40)
+    barcode_code128 = fields.Char(
+        compute='_compute_barcode_code128',
+        help="Barcode in Code128-B with start char, checksum and stop char")
 
     _sql_constraints = [(
         # Maybe it could be better to have a constrain per company
@@ -26,3 +26,32 @@ class ProductProduct(models.Model):
         'default_code_uniq',
         'unique(default_code)',
         'This internal reference already exists!')]
+
+    @api.model
+    def _compute_code128_checksum(self, code):
+        # This is NOT a full implementation of code128 checksum
+        csum = 104  # Start B
+        i = 0
+        for char in code:
+            i += 1
+            char_val = ord(char) - 32
+            csum += char_val * i
+        remainder = csum % 103
+        checksum = chr(remainder + 32)
+        return checksum
+
+    @api.depends('barcode')
+    def _compute_barcode_code128(self):
+        # We use Code128-B. Useful info on code128:
+        # https://boowiki.info/art/codes-a-barres/code-128.html
+        # Use code128.ttf and copy it in /usr/local/share/fonts/
+        startb = chr(209)
+        stop = chr(211)
+        for product in self:
+            code128 = False
+            barcode = product.barcode
+            if barcode and all([32 <= ord(x) <= 127 for x in barcode]):
+                checksum = self._compute_code128_checksum(barcode)
+                if checksum:
+                    code128 = startb + barcode + checksum + stop
+            product.barcode_code128 = code128
diff --git a/product_usability/models/product_template.py b/product_usability/models/product_template.py
index 01d3458..833fe60 100644
--- a/product_usability/models/product_template.py
+++ b/product_usability/models/product_template.py
@@ -1,4 +1,4 @@
-# Copyright 2015-2020 Akretion (http://www.akretion.com)
+# Copyright 2015-2021 Akretion (http://www.akretion.com)
 # @author Alexis de Lattre <alexis.delattre@akretion.com>
 # @author Raphaël Valyi <rvalyi@akretion.com>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
@@ -21,9 +21,12 @@ class ProductTemplate(models.Model):
     # are only shown in the form view of product.template, not in the form
     # view of product.product
     name = fields.Char(tracking=10)
-    categ_id = fields.Many2one(tracking=20)
-    type = fields.Selection(tracking=30)
-    list_price = fields.Float(tracking=40)
-    sale_ok = fields.Boolean(tracking=50)
-    purchase_ok = fields.Boolean(tracking=60)
-    active = fields.Boolean(tracking=70)
+    barcode = fields.Char(tracking=20)
+    default_code = fields.Char(tracking=30)
+    categ_id = fields.Many2one(tracking=40)
+    type = fields.Selection(tracking=50)
+    list_price = fields.Float(tracking=60)
+    weight = fields.Float(tracking=70)
+    sale_ok = fields.Boolean(tracking=80)
+    purchase_ok = fields.Boolean(tracking=90)
+    active = fields.Boolean(tracking=100)