diff --git a/README.md b/README.md
index d18d956e..258d06e1 100644
--- a/README.md
+++ b/README.md
@@ -144,6 +144,7 @@ If your device is unlisted but working, please open a pull request to update the
 * HS300
 * KP303
 * KP400
+* KP405 (dimmer)
 
 ### Wall switches
 
diff --git a/kasa/tests/conftest.py b/kasa/tests/conftest.py
index fa925630..4ea9846e 100644
--- a/kasa/tests/conftest.py
+++ b/kasa/tests/conftest.py
@@ -56,7 +56,7 @@ PLUGS = {
     "KS200M",
 }
 STRIPS = {"HS107", "HS300", "KP303", "KP400", "EP40"}
-DIMMERS = {"ES20M", "HS220", "KS220M", "KS230"}
+DIMMERS = {"ES20M", "HS220", "KS220M", "KS230", "KP405"}
 
 DIMMABLE = {*BULBS, *DIMMERS}
 WITH_EMETER = {"HS110", "HS300", "KP115", "KP125", *BULBS}
diff --git a/kasa/tests/fixtures/KP405(US)_1.0_1.0.5.json b/kasa/tests/fixtures/KP405(US)_1.0_1.0.5.json
new file mode 100644
index 00000000..ad6357f3
--- /dev/null
+++ b/kasa/tests/fixtures/KP405(US)_1.0_1.0.5.json
@@ -0,0 +1,65 @@
+{
+    "smartlife.iot.dimmer": {
+        "get_dimmer_parameters": {
+            "bulb_type": 1,
+            "calibration_type": 0,
+            "err_code": 0,
+            "fadeOffTime": 1000,
+            "fadeOnTime": 1000,
+            "gentleOffTime": 10000,
+            "gentleOnTime": 3000,
+            "minThreshold": 1,
+            "rampRate": 30
+        }
+    },
+    "system": {
+        "get_sysinfo": {
+            "active_mode": "none",
+            "alias": "Porch Lights",
+            "brightness": 50,
+            "dev_name": "Kasa Smart Wi-Fi Outdoor Plug-In Dimmer",
+            "deviceId": "0000000000000000000000000000000000000000",
+            "err_code": 0,
+            "feature": "TIM",
+            "hwId": "00000000000000000000000000000000",
+            "hw_ver": "1.0",
+            "icon_hash": "",
+            "latitude_i": 0,
+            "led_off": 1,
+            "longitude_i": 0,
+            "mac": "00:00:00:00:00:00",
+            "mic_type": "IOT.SMARTPLUGSWITCH",
+            "model": "KP405(US)",
+            "next_action": {
+                "type": -1
+            },
+            "ntc_state": 0,
+            "obd_src": "tplink",
+            "oemId": "00000000000000000000000000000000",
+            "on_time": 0,
+            "preferred_state": [
+                {
+                    "brightness": 100,
+                    "index": 0
+                },
+                {
+                    "brightness": 75,
+                    "index": 1
+                },
+                {
+                    "brightness": 50,
+                    "index": 2
+                },
+                {
+                    "brightness": 25,
+                    "index": 3
+                }
+            ],
+            "relay_state": 0,
+            "rssi": -64,
+            "status": "new",
+            "sw_ver": "1.0.5 Build 221108 Rel.181739",
+            "updating": 0
+        }
+    }
+}