diff --git a/homeassistant/components/alexa/capabilities.py b/homeassistant/components/alexa/capabilities.py
index ac4784132f5..008870c8dd9 100644
--- a/homeassistant/components/alexa/capabilities.py
+++ b/homeassistant/components/alexa/capabilities.py
@@ -1564,7 +1564,7 @@ class AlexaRangeController(AlexaCapability):
             min_value = float(self.entity.attributes[input_number.ATTR_MIN])
             max_value = float(self.entity.attributes[input_number.ATTR_MAX])
             precision = float(self.entity.attributes.get(input_number.ATTR_STEP, 1))
-            unit = self.entity.attributes.get(input_number.ATTR_UNIT_OF_MEASUREMENT)
+            unit = self.entity.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
 
             self._resource = AlexaPresetResource(
                 ["Value", AlexaGlobalCatalog.SETTING_PRESET],
diff --git a/homeassistant/components/input_number/__init__.py b/homeassistant/components/input_number/__init__.py
index 8ec26ea3956..1f979cad7a9 100644
--- a/homeassistant/components/input_number/__init__.py
+++ b/homeassistant/components/input_number/__init__.py
@@ -7,11 +7,11 @@ import voluptuous as vol
 from homeassistant.const import (
     ATTR_EDITABLE,
     ATTR_MODE,
-    ATTR_UNIT_OF_MEASUREMENT,
     CONF_ICON,
     CONF_ID,
     CONF_MODE,
     CONF_NAME,
+    CONF_UNIT_OF_MEASUREMENT,
     SERVICE_RELOAD,
 )
 from homeassistant.core import callback
@@ -67,7 +67,7 @@ CREATE_FIELDS = {
     vol.Optional(CONF_INITIAL): vol.Coerce(float),
     vol.Optional(CONF_STEP, default=1): vol.All(vol.Coerce(float), vol.Range(min=1e-3)),
     vol.Optional(CONF_ICON): cv.icon,
-    vol.Optional(ATTR_UNIT_OF_MEASUREMENT): cv.string,
+    vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
     vol.Optional(CONF_MODE, default=MODE_SLIDER): vol.In([MODE_BOX, MODE_SLIDER]),
 }
 
@@ -78,7 +78,7 @@ UPDATE_FIELDS = {
     vol.Optional(CONF_INITIAL): vol.Coerce(float),
     vol.Optional(CONF_STEP): vol.All(vol.Coerce(float), vol.Range(min=1e-3)),
     vol.Optional(CONF_ICON): cv.icon,
-    vol.Optional(ATTR_UNIT_OF_MEASUREMENT): cv.string,
+    vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
     vol.Optional(CONF_MODE): vol.In([MODE_BOX, MODE_SLIDER]),
 }
 
@@ -95,7 +95,7 @@ CONFIG_SCHEMA = vol.Schema(
                         vol.Coerce(float), vol.Range(min=1e-3)
                     ),
                     vol.Optional(CONF_ICON): cv.icon,
-                    vol.Optional(ATTR_UNIT_OF_MEASUREMENT): cv.string,
+                    vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
                     vol.Optional(CONF_MODE, default=MODE_SLIDER): vol.In(
                         [MODE_BOX, MODE_SLIDER]
                     ),
@@ -250,7 +250,7 @@ class InputNumber(RestoreEntity):
     @property
     def unit_of_measurement(self):
         """Return the unit the value is expressed in."""
-        return self._config.get(ATTR_UNIT_OF_MEASUREMENT)
+        return self._config.get(CONF_UNIT_OF_MEASUREMENT)
 
     @property
     def unique_id(self) -> typing.Optional[str]:
diff --git a/homeassistant/helpers/selector.py b/homeassistant/helpers/selector.py
index d3e96a5205e..d02a41f5f97 100644
--- a/homeassistant/helpers/selector.py
+++ b/homeassistant/helpers/selector.py
@@ -3,6 +3,7 @@ from typing import Any, Callable, Dict, cast
 
 import voluptuous as vol
 
+from homeassistant.const import CONF_MODE, CONF_UNIT_OF_MEASUREMENT
 from homeassistant.util import decorator
 
 SELECTORS = decorator.Registry()
@@ -68,3 +69,39 @@ class DeviceSelector(Selector):
             vol.Optional("model"): str,
         }
     )
+
+
+@SELECTORS.register("number")
+class NumberSelector(Selector):
+    """Selector of a numeric value."""
+
+    CONFIG_SCHEMA = vol.Schema(
+        {
+            vol.Required("min"): vol.Coerce(float),
+            vol.Required("max"): vol.Coerce(float),
+            vol.Optional("step", default=1): vol.All(
+                vol.Coerce(float), vol.Range(min=1e-3)
+            ),
+            vol.Optional(CONF_UNIT_OF_MEASUREMENT): str,
+            vol.Optional(CONF_MODE, default="slider"): vol.In(["box", "slider"]),
+        }
+    )
+
+
+@SELECTORS.register("boolean")
+class BooleanSelector(Selector):
+    """Selector of a boolean value."""
+
+    CONFIG_SCHEMA = vol.Schema({})
+
+
+@SELECTORS.register("datetime")
+class DateTimeSelector(Selector):
+    """Selector of a date and or time value."""
+
+    CONFIG_SCHEMA = vol.Schema(
+        {
+            vol.Optional("has_date", default=False): bool,
+            vol.Optional("has_time", default=False): bool,
+        }
+    )
diff --git a/tests/helpers/test_selector.py b/tests/helpers/test_selector.py
index a8410821c42..c5b11285e48 100644
--- a/tests/helpers/test_selector.py
+++ b/tests/helpers/test_selector.py
@@ -66,3 +66,42 @@ def test_device_selector_schema(schema):
 def test_entity_selector_schema(schema):
     """Test entity selector."""
     selector.validate_selector({"entity": schema})
+
+
+@pytest.mark.parametrize(
+    "schema",
+    (
+        {"min": 10, "max": 50},
+        {"min": -100, "max": 100, "step": 5},
+        {"min": -20, "max": -10, "mode": "box"},
+        {"min": 0, "max": 100, "unit_of_measurement": "seconds", "mode": "slider"},
+        {"min": 10, "max": 1000, "mode": "slider", "step": 0.5},
+    ),
+)
+def test_number_selector_schema(schema):
+    """Test number selector."""
+    selector.validate_selector({"number": schema})
+
+
+@pytest.mark.parametrize(
+    "schema",
+    ({},),
+)
+def test_boolean_selector_schema(schema):
+    """Test boolean selector."""
+    selector.validate_selector({"boolean": schema})
+
+
+@pytest.mark.parametrize(
+    "schema",
+    (
+        {},
+        {"has_date": True, "has_time": True},
+        {"has_date": False, "has_time": False},
+        {"has_date": True, "has_time": False},
+        {"has_date": False, "has_time": True},
+    ),
+)
+def test_datetime_selector_schema(schema):
+    """Test datetime selector."""
+    selector.validate_selector({"datetime": schema})