diff --git a/tuhi/base.py b/tuhi/base.py
index 6fd833d..332223f 100644
--- a/tuhi/base.py
+++ b/tuhi/base.py
@@ -21,6 +21,7 @@ from gi.repository import GObject, GLib
 from tuhi.dbusserver import TuhiDBusServer
 from tuhi.ble import BlueZDeviceManager
 from tuhi.wacom import WacomDevice
+from tuhi.wacom import Protocol
 from tuhi.config import TuhiConfig
 
 logging.basicConfig(format='%(levelname)s: %(name)s: %(message)s',
@@ -167,7 +168,10 @@ class TuhiDevice(GObject.Object):
         self._tuhi_dbus_device.notify_button_press_required()
 
     def _on_uuid_updated(self, wacom_device, pspec, bluez_device):
-        self.config.new_device(bluez_device.address, wacom_device.uuid)
+        protocol = Protocol.SLATE
+        if wacom_device.is_spark():
+            protocol = Protocol.SPARK
+        self.config.new_device(bluez_device.address, wacom_device.uuid, protocol)
         self.registered = True
 
     def _on_listening_updated(self, dbus_device, pspec):
@@ -287,7 +291,7 @@ class Tuhi(GObject.Object):
             if uuid is None:
                 logger.info(f'{bluez_device.address}: device without config, must be registered first')
                 return
-            logger.debug(f'{bluez_device.address}: UUID {uuid}')
+            logger.debug(f'{bluez_device.address}: UUID {uuid} protocol: {config["Protocol"]}')
 
         # create the device if unknown from us
         if bluez_device.address not in self.devices:
diff --git a/tuhi/config.py b/tuhi/config.py
index 8be0bed..d3f3da9 100644
--- a/tuhi/config.py
+++ b/tuhi/config.py
@@ -19,6 +19,7 @@ import configparser
 import re
 import logging
 from .drawing import Drawing
+from .wacom import Protocol
 
 logger = logging.getLogger('tuhi.config')
 
@@ -67,11 +68,14 @@ class TuhiConfig(GObject.Object):
                 self._purge_drawings(entry)
 
                 assert config['Device']['Address'] == entry.name
+                if 'Protocol' not in config['Device']:
+                    config['Device']['Protocol'] = Protocol.UNKNOWN.value
                 self._devices[entry.name] = config['Device']
 
-    def new_device(self, address, uuid):
+    def new_device(self, address, uuid, protocol):
         assert is_btaddr(address)
         assert len(uuid) == 12
+        assert protocol != Protocol.UNKNOWN
 
         logger.debug(f'{address}: adding new config, UUID {uuid}')
         path = os.path.join(ROOT_PATH, address)
@@ -92,6 +96,7 @@ class TuhiConfig(GObject.Object):
         config['Device'] = {
             'Address': address,
             'UUID': uuid,
+            'Protocol': protocol.value,
         }
 
         with open(path, 'w') as configfile:
diff --git a/tuhi/wacom.py b/tuhi/wacom.py
index 7396c1d..6304220 100644
--- a/tuhi/wacom.py
+++ b/tuhi/wacom.py
@@ -14,6 +14,7 @@
 
 import binascii
 import calendar
+import enum
 import logging
 import threading
 import time
@@ -42,6 +43,14 @@ WACOM_SLATE_WIDTH = 21600
 WACOM_SLATE_HEIGHT = 14800
 
 
+@enum.unique
+class Protocol(enum.Enum):
+    UNKNOWN = 'unknown'
+    SPARK = 'spark'
+    SLATE = 'slate'
+    INTUOS_PRO = 'intuos-pro'
+
+
 def signed_char_to_int(v):
     return int.from_bytes([v], byteorder='little', signed=True)