diff --git a/src/drivers/endgame/egg-op1-hid.ts b/src/drivers/endgame/egg-op1-hid.ts
index 9f2365e..5c3081d 100644
--- a/src/drivers/endgame/egg-op1-hid.ts
+++ b/src/drivers/endgame/egg-op1-hid.ts
@@ -99,7 +99,7 @@ export class EggOp1HidClient {
 
   constructor(device: HIDDevice) {
     this.device = device;
-    this.profile = eggProfileForPid(device.productId, device.productName);
+    this.profile = eggProfileForPid(device.productId);
   }
 
   static isSupported(device: HIDDevice): boolean {
diff --git a/src/drivers/endgame/egg-op1-protocol.test.ts b/src/drivers/endgame/egg-op1-protocol.test.ts
index 7e6de3c..8f0c75d 100644
--- a/src/drivers/endgame/egg-op1-protocol.test.ts
+++ b/src/drivers/endgame/egg-op1-protocol.test.ts
@@ -41,13 +41,14 @@ test("OP1w 4K v2 wireless models are capped at 4000 Hz while wired 8K models kee
   assert.equal(EGG_DEVICE_PROFILES.get(0x1970)!.maxPollingHz, 4000);
 });
 
-test("the shared 4K v2 dongle PIDs resolve to XM2w by the mouse's own reported name, not OP1w by default", () => {
-  assert.equal(eggProfileForPid(0x1970).name, "Endgame Gear OP1w 4K v2");
-  assert.equal(eggProfileForPid(0x1984).name, "Endgame Gear OP1w 4K v2");
-  assert.equal(eggProfileForPid(0x1970, "Endgame Gear XM2w 4K v2").name, "Endgame Gear XM2w 4K v2");
-  assert.equal(eggProfileForPid(0x1984, "Endgame Gear XM2w 4K v2").name, "Endgame Gear XM2w 4K v2");
-  // A wired-model PID is never reinterpreted, even if a name happened to mention "xm2".
-  assert.equal(eggProfileForPid(0x1978, "xm2").name, "Endgame Gear OP1 8K v2");
+test("the shared 4K v2 dongle PIDs report a neutral OP1w/XM2w name, since WebHID has no way to tell them apart", () => {
+  // Confirmed on real hardware: an XM2w 4K v2 reports device.productName as
+  // "Endgame Gear OP1we" — the receiver's fixed USB descriptor string, the
+  // same regardless of which mouse is actually paired. There is no signal
+  // available to resolve this to one specific model, so the name says both
+  // rather than confidently claiming the wrong one.
+  assert.equal(eggProfileForPid(0x1970).name, "Endgame Gear OP1w/XM2w 4K v2");
+  assert.equal(eggProfileForPid(0x1984).name, "Endgame Gear OP1w/XM2w 4K v2");
 });
 
 test("CPI ranges and quantization follow each sensor generation", () => {
diff --git a/src/endgame-gear/op1.ts b/src/endgame-gear/op1.ts
index 61c58e4..6f7259f 100644
--- a/src/endgame-gear/op1.ts
+++ b/src/endgame-gear/op1.ts
@@ -113,17 +113,21 @@ export const EGG_DEVICE_PROFILES: ReadonlyMap<number, EggDeviceProfile> = new Ma
     motionSyncAt8k: true,
     maxPollingHz: 8000,
   }],
-  // OP1w 4K v2: first wireless model on the OP1-8K v2 config protocol. The
-  // dongle's own USB PID (0x1970) is reused from the older, unrelated OP1we
-  // (see egg-we-hid.ts) — descriptor-based detection there keeps the two
-  // drivers from both claiming it. See issue #107. That same dongle PID (and
-  // its 0x1984 successor) is also reused across the OP1w and XM2w 4K v2
-  // mice — the receiver hardware doesn't distinguish them, only the mouse's
-  // own reported name does, so `eggProfileForPid` takes the device name and
-  // resolves to `EGG_XM2W_4K_V2_PIDS` below when it mentions "xm2".
+  // OP1w/XM2w 4K v2: first wireless models on the OP1-8K v2 config protocol.
+  // The dongle's own USB PID (0x1970) is reused from the older, unrelated
+  // OP1we (see egg-we-hid.ts) — descriptor-based detection there keeps the
+  // two drivers from both claiming it. See issue #107. That same dongle PID
+  // (and its 0x1984 successor) is ALSO shared between the OP1w and XM2w 4K v2
+  // mice themselves — confirmed on real hardware (an XM2w 4K v2 reports as
+  // "Endgame Gear OP1we", the receiver's fixed USB descriptor string, with no
+  // "xm2" anywhere in it). WebHID has no way to tell them apart: the
+  // descriptor name is generic and fixed regardless of the paired mouse, and
+  // nothing in the config/firmware read protocol carries a model id. Rather
+  // than confidently claim the wrong specific model, this profile's name
+  // says both, until a real distinguishing signal turns up.
   [0x1984, {
     pid: 0x1984,
-    name: "Endgame Gear OP1w 4K v2",
+    name: "Endgame Gear OP1w/XM2w 4K v2",
     configFamily: "v2",
     sensorFamily: "paw3950",
     cpiMin: 10,
@@ -137,7 +141,7 @@ export const EGG_DEVICE_PROFILES: ReadonlyMap<number, EggDeviceProfile> = new Ma
   }],
   [0x1970, {
     pid: 0x1970,
-    name: "Endgame Gear OP1w 4K v2",
+    name: "Endgame Gear OP1w/XM2w 4K v2",
     configFamily: "v2",
     sensorFamily: "paw3950",
     cpiMin: 10,
@@ -151,14 +155,6 @@ export const EGG_DEVICE_PROFILES: ReadonlyMap<number, EggDeviceProfile> = new Ma
   }],
 ]);
 
-/** PIDs whose dongle is shared between an OP1w and an XM2w 4K v2 mouse. */
-const EGG_XM2W_4K_V2_PIDS = new Set([0x1970, 0x1984]);
-
-const EGG_XM2W_4K_V2_PROFILE: EggDeviceProfile = {
-  ...EGG_DEVICE_PROFILES.get(0x1984)!,
-  name: "Endgame Gear XM2w 4K v2",
-};
-
 export const EGG_REPORT = {
   config: 0xa0,
   command: 0xa1,
@@ -233,8 +229,7 @@ export function eggNormalizeFeatureReport(
   return result;
 }
 
-export function eggProfileForPid(pid: number, productName = ""): EggDeviceProfile {
-  if (EGG_XM2W_4K_V2_PIDS.has(pid) && productName.toLowerCase().includes("xm2")) return EGG_XM2W_4K_V2_PROFILE;
+export function eggProfileForPid(pid: number): EggDeviceProfile {
   const profile = EGG_DEVICE_PROFILES.get(pid);
   if (!profile) throw new Error(`Unsupported Endgame Gear product 0x${pid.toString(16)}.`);
   return profile;