diff --git a/tests/test_client.py b/tests/test_client.py
new file mode 100644
index 0000000..5d10eb0
--- /dev/null
+++ b/tests/test_client.py
@@ -0,0 +1,110 @@
+import unittest
+
+from wideq.client import (
+    BitValue, EnumValue, ModelInfo, RangeValue, ReferenceValue)
+
+
+DATA = {
+    'Value': {
+        'AntiBacterial': {
+            'default': '0',
+            'label': '@WM_DRY27_BUTTON_ANTI_BACTERIAL_W',
+            'option': {
+                '0': '@CP_OFF_EN_W',
+                '1': '@CP_ON_EN_W'
+            },
+            'type': 'Enum'
+        },
+        'Course': {
+            'option': ['Course'],
+            'type': 'Reference',
+        },
+        'Initial_Time_H': {
+            'default': 0,
+            'option': {'max': 24, 'min': 0},
+            'type': 'Range'
+        },
+        'Option1': {
+            'default': '0',
+            'option': [
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 0,
+                    'value': 'ChildLock'
+                },
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 1,
+                    'value': 'ReduceStatic'
+                },
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 2,
+                    'value': 'EasyIron'
+                },
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 3,
+                    'value': 'DampDrySingal'
+                },
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 4,
+                    'value': 'WrinkleCare'
+                },
+                {
+                    'default': '0',
+                    'length': 1,
+                    'startbit': 7,
+                    'value': 'AntiBacterial'
+                }
+            ],
+            'type': 'Bit'
+        },
+        'Unexpected': {'type': 'Unexpected'},
+    },
+}
+
+
+class ModelInfoTest(unittest.TestCase):
+
+    def setUp(self):
+        super().setUp()
+        self.model_info = ModelInfo(DATA)
+
+    def test_value_enum(self):
+        actual = self.model_info.value('AntiBacterial')
+        expected = EnumValue({'0': '@CP_OFF_EN_W', '1': '@CP_ON_EN_W'})
+        self.assertEqual(expected, actual)
+
+    def test_value_range(self):
+        actual = self.model_info.value('Initial_Time_H')
+        expected = RangeValue(min=0, max=24, step=1)
+        self.assertEqual(expected, actual)
+
+    def test_value_bit(self):
+        actual = self.model_info.value('Option1')
+        expected = BitValue({
+            0: 'ChildLock',
+            1: 'ReduceStatic',
+            2: 'EasyIron',
+            3: 'DampDrySingal',
+            4: 'WrinkleCare',
+            7: 'AntiBacterial',
+        })
+        self.assertEqual(expected, actual)
+
+    def test_value_reference(self):
+        actual = self.model_info.value('Course')
+        expected = ReferenceValue('Course')
+        self.assertEqual(expected, actual)
+
+    def test_value_unsupported(self):
+        with self.assertRaisesRegex(
+                ValueError, 'unsupported value type Unexpected'):
+            self.model_info.value('Unexpected')
diff --git a/wideq/client.py b/wideq/client.py
index 23ea607..4b1be67 100644
--- a/wideq/client.py
+++ b/wideq/client.py
@@ -293,8 +293,10 @@ class DeviceInfo(object):
         return requests.get(self.model_info_url).json()
 
 
+BitValue = namedtuple('BitValue', ['options'])
 EnumValue = namedtuple('EnumValue', ['options'])
 RangeValue = namedtuple('RangeValue', ['min', 'max', 'step'])
+ReferenceValue = namedtuple('ReferenceValue', ['reference'])
 
 
 class ModelInfo(object):
@@ -304,31 +306,38 @@ class ModelInfo(object):
     def __init__(self, data):
         self.data = data
 
-    def value(self, name):
+    def value(self, name: str):
         """Look up information about a value.
 
-        Return either an `EnumValue` or a `RangeValue`.
+        :param name: The name to look up.
+        :returns: One of (`BitValue`, `EnumValue`, `RangeValue`,
+            `ReferenceValue`).
+        :raises ValueError: If an unsupported type is encountered.
         """
         d = self.data['Value'][name]
         if d['type'] in ('Enum', 'enum'):
             return EnumValue(d['option'])
         elif d['type'] == 'Range':
             return RangeValue(
-                d['option']['min'], d['option']['max'], d['option']['step']
+                d['option']['min'], d['option']['max'],
+                d['option'].get('step', 1)
             )
+        elif d['type'].lower() == 'bit':
+            bit_values = {opt['startbit']: opt['value'] for opt in d['option']}
+            return BitValue(bit_values)
+        elif d['type'].lower() == 'reference':
+            return ReferenceValue(d['option'][0])
         else:
-            assert False, "unsupported value type {}".format(d['type'])
+            raise ValueError("unsupported value type {}".format(d['type']))
 
     def default(self, name):
         """Get the default value, if it exists, for a given value.
         """
-
         return self.data['Value'][name]['default']
 
     def enum_value(self, key, name):
         """Look up the encoded value for a friendly enum name.
         """
-
         options = self.value(key).options
         options_inv = {v: k for k, v in options.items()}  # Invert the map.
         return options_inv[name]
@@ -336,7 +345,6 @@ class ModelInfo(object):
     def enum_name(self, key, value):
         """Look up the friendly enum name for an encoded value.
         """
-
         options = self.value(key).options
         return options[value]
 
@@ -344,13 +352,11 @@ class ModelInfo(object):
     def binary_monitor_data(self):
         """Check that type of monitoring is BINARY(BYTE).
         """
-
         return self.data['Monitoring']['type'] == 'BINARY(BYTE)'
 
     def decode_monitor_binary(self, data):
         """Decode binary encoded status data.
         """
-
         decoded = {}
         for item in self.data['Monitoring']['protocol']:
             key = item['value']
@@ -363,12 +369,10 @@ class ModelInfo(object):
 
     def decode_monitor_json(self, data):
         """Decode a bytestring that encodes JSON status data."""
-
         return json.loads(data.decode('utf8'))
 
     def decode_monitor(self, data):
         """Decode  status data."""
-
         if self.binary_monitor_data:
             return self.decode_monitor_binary(data)
         else: