diff --git a/README.md b/README.md
index c81b69cc..439c9f07 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,7 @@ logitune
 | MX Anywhere 3S for Business | 🧪 Beta | ✅ | ✅ | ✅ | — | ✅ | — | ✅ | ✅ |
 | MX Vertical | 🧪 Beta | ✅ | ✅ | — | — | ✅ | — | ✅ | ✅ |
 | MX Vertical for Business | 🧪 Beta | ✅ | ✅ | — | — | ✅ | — | ✅ | ✅ |
+| Signature M650 | 🧪 Beta | ✅ | ✅ | — | — | ✅ | — | ✅ | — |
 <!-- END DEVICES TABLE -->
 
 > **MX Master 4 smooth scrolling** is disabled in the shipped descriptor: the hardware does not respond correctly to the HID++ configuration used on MX Master 2S / 3S. Regular scroll wheel and SmartShift work normally; only sub-tick smoothing is unavailable. Re-enable yourself by setting `"smoothScroll": true` in `devices/mx-master-4/descriptor.json` if your unit behaves differently; if it works we will promote the default.
diff --git a/devices/signature-m650/back.png b/devices/signature-m650/back.png
new file mode 100644
index 00000000..8766c16d
Binary files /dev/null and b/devices/signature-m650/back.png differ
diff --git a/devices/signature-m650/descriptor.json b/devices/signature-m650/descriptor.json
new file mode 100644
index 00000000..da40057f
--- /dev/null
+++ b/devices/signature-m650/descriptor.json
@@ -0,0 +1,109 @@
+{
+    "$schema": "../schema.json",
+    "name": "Signature M650",
+    "status": "beta",
+    "productIds": [
+        "0xb02a"
+    ],
+    "features": {
+        "battery": true,
+        "adjustableDpi": true,
+        "extendedDpi": false,
+        "smartShift": false,
+        "hiResWheel": false,
+        "lowResWheel": true,
+        "smoothScroll": true,
+        "thumbWheel": false,
+        "reprogControls": true,
+        "gestureV2": false
+    },
+    "dpi": {
+        "min": 400,
+        "max": 4000,
+        "step": 100
+    },
+    "controls": [
+        {
+            "controlId": "0x0050",
+            "buttonIndex": 0,
+            "defaultName": "Left click",
+            "defaultActionType": "default",
+            "configurable": false
+        },
+        {
+            "controlId": "0x0051",
+            "buttonIndex": 1,
+            "defaultName": "Right click",
+            "defaultActionType": "default",
+            "configurable": false
+        },
+        {
+            "controlId": "0x0052",
+            "buttonIndex": 2,
+            "defaultName": "Middle click",
+            "defaultActionType": "default",
+            "configurable": true
+        },
+        {
+            "controlId": "0x0053",
+            "buttonIndex": 3,
+            "defaultName": "Back",
+            "defaultActionType": "default",
+            "configurable": true
+        },
+        {
+            "controlId": "0x0056",
+            "buttonIndex": 4,
+            "defaultName": "Forward",
+            "defaultActionType": "default",
+            "configurable": true
+        },
+        {
+            "controlId": "0x0000",
+            "buttonIndex": 5,
+            "defaultName": "Scroll wheel",
+            "defaultActionType": "default",
+            "configurable": false
+        }
+    ],
+    "hotspots": {
+        "buttons": [
+            {
+                "buttonIndex": 2,
+                "xPct": 0.65,
+                "yPct": 0.18,
+                "side": "right",
+                "labelOffsetYPct": 0.0
+            },
+            {
+                "buttonIndex": 4,
+                "xPct": 0.28,
+                "yPct": 0.40,
+                "side": "left",
+                "labelOffsetYPct": 0.0
+            },
+            {
+                "buttonIndex": 3,
+                "xPct": 0.38,
+                "yPct": 0.52,
+                "side": "left",
+                "labelOffsetYPct": 0.0
+            }
+        ],
+        "scroll": [
+            {
+                "buttonIndex": -1,
+                "xPct": 0.65,
+                "yPct": 0.15,
+                "side": "right",
+                "labelOffsetYPct": 0.0,
+                "kind": "scrollwheel"
+            }
+        ]
+    },
+    "images": {
+        "front": "front.png",
+        "side": "side.png",
+        "back": "back.png"
+    }
+}
\ No newline at end of file
diff --git a/devices/signature-m650/front.png b/devices/signature-m650/front.png
new file mode 100644
index 00000000..d3f089a7
Binary files /dev/null and b/devices/signature-m650/front.png differ
diff --git a/devices/signature-m650/side.png b/devices/signature-m650/side.png
new file mode 100644
index 00000000..27e6b4ab
Binary files /dev/null and b/devices/signature-m650/side.png differ
diff --git a/tests/test_device_registry.cpp b/tests/test_device_registry.cpp
index 5c8f974b..4a11ba7a 100644
--- a/tests/test_device_registry.cpp
+++ b/tests/test_device_registry.cpp
@@ -158,6 +158,21 @@ static const DeviceSpec kDevices[] = {
         .gestureDownPayload = nullptr,
         .gestureUpType = ButtonAction::Default,
     },
+    {
+        .pid = 0xb02a,
+        .name = "Signature M650",
+        .minDpi = 400, .maxDpi = 4000, .dpiStep = 100,
+        .buttonHotspots = 3, .scrollHotspots = 1,
+        .minControls = 6,
+        .control0Cid = 0x0050, .control5Cid = 0x0000,
+        .control5ActionType = "default",
+        .control6ActionType = nullptr,
+        .battery = true, .adjustableDpi = true, .smartShift = false,
+        .reprogControls = true, .gestureV2 = false,
+        .gestureDownType = ButtonAction::Default,
+        .gestureDownPayload = nullptr,
+        .gestureUpType = ButtonAction::Default,
+    },
 };
 
 class DeviceRegistryTest : public testing::TestWithParam<DeviceSpec> {