diff --git a/psychopy_labhackers/millikey.py b/psychopy_labhackers/millikey.py
index ba5b48f..f75b362 100644
--- a/psychopy_labhackers/millikey.py
+++ b/psychopy_labhackers/millikey.py
@@ -1,5 +1,7 @@
-from psychopy import logging
-from psychopy.hardware.button import KeyboardButtonBox, ButtonResponse
+from psychopy import logging, core
+from psychopy.hardware import serialdevice as sd
+from psychopy.tools import systemtools as st
+from psychopy.hardware.button import KeyboardButtonBox, BaseButtonGroup, ButtonResponse
 
 
 class MillikeyHIDButtonGroup(KeyboardButtonBox):
@@ -7,11 +9,55 @@ def __init__(self, buttons=(1, 2, 3, 4, 5, 6, 7, 8)):
         # initialise base class
         KeyboardButtonBox.__init__(self, buttons=buttons)
 
+
+class MillikeySerialButtonGroup(BaseButtonGroup):
+    def __init__(self, port=None, channels=8):
+        BaseButtonGroup.__init__(self)
+        # get port if not given
+        if port is None:
+            profiles = self.getAvailableDevices()
+            if len(profiles):
+                port = profiles[0]['port']
+        # if port is still None by here, there's not a device connected
+        if port is None:
+            raise ConnectionError("Could not detect any Millikey device. Try ")
+        # setup serial
+        self.serial = sd.SerialDevice(port=port)
+        # setup clock
+        self.clock = core.Clock()
+
     def resetTimer(self, clock=logging.defaultClock):
-        pass
+        self.clock.reset(clock.getTime())
 
     @staticmethod
     def getAvailableDevices():
         devices = []
+        for profile in st.systemProfilerWindowsOS(classname="Ports", connected=True):
+            # identify by driver name
+            if "usbser.inf" not in profile['Driver Name']:
+                continue
+            # find "COM" in profile description
+            desc = profile['Device Description']
+            start = desc.find("COM") + 3
+            end = desc.find(")", start)
+            # if there's no reference to a COM port, skip
+            if -1 in (start, end):
+                continue
+            # get COM port number
+            num = desc[start:end]
+            devices.append({
+                'deviceName': profile['Instance ID'],
+                'port': f"COM{num}",
+            })
 
         return devices
+
+    def dispatchMessages(self):
+        for message in self.serial.getResponse(length=2):
+            resp = self.parseMessage(message)
+            self.receiveMessage(resp)
+
+    def parseMessage(self, message):
+        keyNum = int(message)
+        state = not self.getState(keyNum)
+        return ButtonResponse(self.clock.getTime(), state, keyNum)