diff --git a/adafruit_monsterm4sk.py b/adafruit_monsterm4sk.py
index bb044bb..b4ca026 100644
--- a/adafruit_monsterm4sk.py
+++ b/adafruit_monsterm4sk.py
@@ -39,6 +39,12 @@
 from adafruit_st7789 import ST7789
 import adafruit_lis3dh
 
+try:
+    from typing import Optional, Dict, Union
+    from busio import I2C
+except ImportError:
+    pass
+
 __version__ = "0.0.0+auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MONSTERM4SK.git"
 
@@ -62,7 +68,7 @@ class MonsterM4sk:
     The right screen is the one USB port directly above it.
     """
 
-    def __init__(self, i2c=None):
+    def __init__(self, i2c: Optional[I2C] = None):
         """
         :param i2c: The I2C bus to use, will try board.I2C()
             if not supplied
@@ -150,7 +156,7 @@ def __init__(self, i2c=None):
         self.nose.threshold = 180
 
     @property
-    def acceleration(self):
+    def acceleration(self) -> Union[float, None]:
         """Accelerometer data, +/- 2G sensitivity.
 
         This example initializes the mask and prints the accelerometer data.
@@ -169,7 +175,7 @@ def acceleration(self):
         )
 
     @property
-    def light(self):
+    def light(self) -> int:
         """Light sensor data.
 
         This example initializes the mask and prints the light sensor data.
@@ -184,7 +190,7 @@ def light(self):
         return self._ss.analog_read(SS_LIGHTSENSOR_PIN)
 
     @property
-    def buttons(self):
+    def buttons(self) -> Dict[str, bool]:
         """Buttons dictionary.
 
         This example initializes the mask and prints when the S9 button
@@ -208,7 +214,7 @@ def buttons(self):
         }
 
     @property
-    def boop(self):
+    def boop(self) -> bool:
         """Nose touch sense.
 
         This example initializes the mask and prints when the nose touch pad