diff --git a/custom_components/localthings/registry/capabilities/common.py b/custom_components/localthings/registry/capabilities/common.py
index 45889b4..945903a 100644
--- a/custom_components/localthings/registry/capabilities/common.py
+++ b/custom_components/localthings/registry/capabilities/common.py
@@ -313,12 +313,19 @@ KIDS_LOCK_VS_FALLBACK = Capability(
     href='/kidslock/vs/0',
     match_fn=lambda rep, resources: '/kidslock/0' not in resources,
     entities=(
-        SwitchDesc(key='child_lock', field='x.com.samsung.da.kidsLock',
-                   device_class='lock',
-                   value_fn=lambda v: v != 'Ready',
-                   write_fn=lambda p, rep, href=None: (
-                       ['kidslock', 'vs', '0'],
-                       {'x.com.samsung.da.kidsLock': 'Enable' if p == 'On' else 'Ready'})),
+        # Read-only, not a SwitchDesc (issues #181/#183): the write side of
+        # this capability wrote 'Enable', a value no dump in the fixture
+        # corpus has ever reported back -- every one reports either 'Ready'
+        # or 'Run', so it was never a confirmed contract. #181's reporter
+        # confirmed this directly: writing the *correct* value ('Run')
+        # still 4.05s, and the SmartThings app itself has no control for
+        # it either -- the resource is genuinely read-only on this
+        # hardware, not just wrong-valued. binary_sensor's 'lock' device
+        # class is inverted from the switch reading below it used to be:
+        # On means open/unlocked, so value_fn flips to `v == 'Ready'`.
+        BinarySensorDesc(key='child_lock', field='x.com.samsung.da.kidsLock',
+                          device_class='lock',
+                          value_fn=lambda v: v == 'Ready'),
     ),
 )
 
diff --git a/custom_components/localthings/translations/en.json b/custom_components/localthings/translations/en.json
index 5d718da..64b7809 100644
--- a/custom_components/localthings/translations/en.json
+++ b/custom_components/localthings/translations/en.json
@@ -16,6 +16,9 @@
       "burner_pan_detected": {
         "name": "Burner {number} pan detected"
       },
+      "child_lock": {
+        "name": "Child lock"
+      },
       "cloud_connected": {
         "name": "Cloud connected"
       },
diff --git a/custom_components/localthings/translations/nl.json b/custom_components/localthings/translations/nl.json
index 890ea12..b48539a 100644
--- a/custom_components/localthings/translations/nl.json
+++ b/custom_components/localthings/translations/nl.json
@@ -16,6 +16,9 @@
       "burner_pan_detected": {
         "name": "Brander {number} pan gedetecteerd"
       },
+      "child_lock": {
+        "name": "Kinderslot"
+      },
       "cloud_connected": {
         "name": "Verbonden met cloud"
       },
diff --git a/tests/test_common_capabilities.py b/tests/test_common_capabilities.py
index 37218cf..7b9741b 100644
--- a/tests/test_common_capabilities.py
+++ b/tests/test_common_capabilities.py
@@ -15,9 +15,13 @@ def _reg():
 
 
 def test_kids_lock_vs_value_fn():
+    """binary_sensor's 'lock' device class is inverted from a plain on/off
+    switch: On means open/unlocked (issues #181/#183 -- see
+    TestKidsLockFallback.test_vs_fallback_is_read_only for why this is a
+    binary_sensor at all)."""
     desc = common.KIDS_LOCK_VS_FALLBACK.entities[0]
-    assert desc.value_fn('Lock') is True
-    assert desc.value_fn('Ready') is False
+    assert desc.value_fn('Lock') is False
+    assert desc.value_fn('Ready') is True
 
 
 def test_common_caps_discover_on_dishwasher(dishwasher_resources):
@@ -241,6 +245,16 @@ class TestKidsLockFallback:
         assert common.KIDS_LOCK_VS_FALLBACK.match_fn(
             {}, {'/kidslock/0': {}, '/kidslock/vs/0': {}}) is False
 
+    def test_vs_fallback_is_read_only(self):
+        """Issues #181/#183: writing this resource 4.05s on real hardware
+        even with the *correct* value ('Run'), and no dump in the fixture
+        corpus has ever reported the value this used to write ('Enable')
+        back -- every one reports 'Ready' or 'Run'. Never a confirmed write
+        contract, so it's a binary_sensor (no write_fn field at all), not
+        a switch."""
+        desc = common.KIDS_LOCK_VS_FALLBACK.entities[0]
+        assert isinstance(desc, BinarySensorDesc)
+
 
 class TestRemoteControlFallback:
     def test_generic_read(self):
diff --git a/tests/test_range_ne6516a_capabilities.py b/tests/test_range_ne6516a_capabilities.py
index ccf905c..c59c1cb 100644
--- a/tests/test_range_ne6516a_capabilities.py
+++ b/tests/test_range_ne6516a_capabilities.py
@@ -56,7 +56,10 @@ def test_energy_saving_and_cooktop_alert_present():
 def test_child_lock_already_reads_correctly():
     """issue #183 also reported child lock as unreadable -- but this dump's
     /kidslock/vs/0 ('Run') and /doors/vs/0's door lock field ('Lock') already
-    agree the door is locked, and the existing common.KIDS_LOCK_VS_FALLBACK
-    already reads that correctly with no code change needed."""
+    agree the door is locked, and common.KIDS_LOCK_VS_FALLBACK already reads
+    that correctly with no further code change needed. Now a read-only
+    binary_sensor (issues #181/#183 -- the write side was never a confirmed
+    contract), whose 'lock' device class is inverted from a switch's plain
+    on/off: False means locked/closed, matching 'Run' here."""
     state = _state()
-    assert state['child_lock'] is True
+    assert state['child_lock'] is False