diff --git a/custom_components/jackery/sensor.py b/custom_components/jackery/sensor.py
index 17bf0cb..fffe074 100644
--- a/custom_components/jackery/sensor.py
+++ b/custom_components/jackery/sensor.py
@@ -489,9 +489,9 @@ class JackeryDataCoordinator:
         self.add_switch_entities_callback = None # Callback to add new switch entities
         self._data_cache = {} # Cache for merged data from status and events
 
-        # Topic patterns
-        self._topic_status_wildcard = f"{self._topic_root}/device/+/status"
-        self._topic_event_wildcard = f"{self._topic_root}/device/+/event"
+        # Topic patterns — device-specific so multiple instances don't cross-receive
+        self._topic_status = f"{self._topic_root}/device/{self._device_sn}/status"
+        self._topic_event = f"{self._topic_root}/device/{self._device_sn}/event"
 
     def register_sensor(self, sensor_id: str, entity: "JackerySensor") -> None:
         """注册传感器实体."""
@@ -515,20 +515,20 @@ class JackeryDataCoordinator:
 
             await ha_mqtt.async_subscribe(
                 self.hass,
-                self._topic_status_wildcard,
+                self._topic_status,
                 message_received,
                 1
             )
-            _LOGGER.info(f"Coordinator subscribed to: {self._topic_status_wildcard}")
+            _LOGGER.info(f"Coordinator subscribed to: {self._topic_status}")
 
             # Subscribe to event topic for sub-device data (Type 101)
             await ha_mqtt.async_subscribe(
                 self.hass,
-                self._topic_event_wildcard,
+                self._topic_event,
                 message_received,
                 1
             )
-            _LOGGER.info(f"Coordinator subscribed to: {self._topic_event_wildcard}")
+            _LOGGER.info(f"Coordinator subscribed to: {self._topic_event}")
 
             self._subscribed = True
 
@@ -557,17 +557,6 @@ class JackeryDataCoordinator:
             if isinstance(payload, bytes):
                 payload = payload.decode("utf-8")
 
-            # Extract device SN from topic: {prefix}/device/{sn}/status OR .../event
-            match = re.search(rf"{self._topic_root}/device/([^/]+)/(status|event)", topic)
-            if match:
-                sn = match.group(1)
-                msg_type = match.group(2) # 'status' or 'event'
-                if not self._device_sn:
-                    self._device_sn = sn
-                    _LOGGER.info(f"Discovered device SN: {self._device_sn}")
-                elif self._device_sn != sn:
-                    _LOGGER.debug(f"Received data from another device: {sn}")
-                    return
 
             # Parse Payload
             try: