diff --git a/custom_components/jackery/config_flow.py b/custom_components/jackery/config_flow.py
index ddc6ca3..3492e79 100644
--- a/custom_components/jackery/config_flow.py
+++ b/custom_components/jackery/config_flow.py
@@ -35,12 +35,15 @@ class JackeryConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:
         """Handle the initial step."""
-        if self._async_current_entries():
-            return self.async_abort(reason="single_instance_allowed")
-
         errors = {}
 
         if user_input is not None:
+            # Check for duplicate device SN
+            new_sn = user_input.get("device_sn", "")
+            for entry in self._async_current_entries():
+                if entry.data.get("device_sn") == new_sn:
+                    return self.async_abort(reason="already_configured")
+
             # 检查 MQTT 集成是否已配置
             if not await mqtt.async_wait_for_mqtt_client(self.hass):
                 errors["base"] = "mqtt_not_configured"
@@ -52,7 +55,7 @@ class JackeryConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                 )
 
                 return self.async_create_entry(
-                    title="Jackery",
+                    title=f"Jackery {new_sn}",
                     data=user_input,
                 )
 
diff --git a/custom_components/jackery/number.py b/custom_components/jackery/number.py
index 07510a3..0efead7 100644
--- a/custom_components/jackery/number.py
+++ b/custom_components/jackery/number.py
@@ -68,15 +68,16 @@ class JackeryMainNumber(NumberEntity):
         self._key = key
         self._coordinator = coordinator
         self._attr_name = name
-        self._attr_unique_id = f"jackery_main_{key}"
+        self._attr_unique_id = f"jackery_{config_entry_id}_main_{key}"
         self._attr_has_entity_name = True
         self._attr_mode = NumberMode.SLIDER
         self._attr_native_min_value = min_value
         self._attr_native_max_value = max_value
         self._attr_native_step = step
+        device_sn = coordinator._device_sn or "Unknown"
         self._attr_device_info = {
             "identifiers": {(DOMAIN, config_entry_id)},
-            "name": "Jackery",
+            "name": f"Jackery {device_sn}",
             "manufacturer": "Jackery",
             "model": "Energy Monitor",
         }
diff --git a/custom_components/jackery/sensor.py b/custom_components/jackery/sensor.py
index c6adeb7..951fd46 100644
--- a/custom_components/jackery/sensor.py
+++ b/custom_components/jackery/sensor.py
@@ -1115,12 +1115,13 @@ class JackerySensor(SensorEntity):
         self._attr_icon = self._config["icon"]
         self._attr_device_class = self._config["device_class"]
         self._attr_state_class = self._config["state_class"]
-        self._attr_unique_id = f"jackery_{sensor_id}"
+        self._attr_unique_id = f"jackery_{config_entry_id}_{sensor_id}"
         self._attr_has_entity_name = True
 
+        device_sn = coordinator._device_sn or "Unknown"
         self._attr_device_info = {
             "identifiers": {(DOMAIN, config_entry_id)},
-            "name": "Jackery",
+            "name": f"Jackery {device_sn}",
             "manufacturer": "Jackery",
             "model": "Energy Monitor",
         }
diff --git a/custom_components/jackery/strings.json b/custom_components/jackery/strings.json
index 9a105d2..1c68a05 100644
--- a/custom_components/jackery/strings.json
+++ b/custom_components/jackery/strings.json
@@ -13,13 +13,11 @@
             }
         },
         "error": {
-            "already_configured": "该集成已配置",
-            "mqtt_not_configured": "MQTT 集成未配置或不可用。请先设置 MQTT 集成：设置 -> 设备与服务 -> 添加集成 -> MQTT",
-            "single_instance_allowed": "只允许一个此集成的实例"
+            "already_configured": "已配置相同序列号的设备",
+            "mqtt_not_configured": "MQTT 集成未配置或不可用。请先设置 MQTT 集成：设置 -> 设备与服务 -> 添加集成 -> MQTT"
         },
         "abort": {
-            "already_configured": "该集成已配置",
-            "single_instance_allowed": "只允许一个此集成的实例"
+            "already_configured": "已配置相同序列号的设备"
         }
     }
 }
\ No newline at end of file
diff --git a/custom_components/jackery/switch.py b/custom_components/jackery/switch.py
index a9cca69..afbb4b3 100644
--- a/custom_components/jackery/switch.py
+++ b/custom_components/jackery/switch.py
@@ -167,11 +167,12 @@ class JackeryMainSwitch(SwitchEntity):
         self._key = key
         self._coordinator = coordinator
         self._attr_name = name
-        self._attr_unique_id = f"jackery_main_{key}"
+        self._attr_unique_id = f"jackery_{config_entry_id}_main_{key}"
         self._attr_has_entity_name = True
+        device_sn = coordinator._device_sn or "Unknown"
         self._attr_device_info = {
             "identifiers": {(DOMAIN, config_entry_id)},
-            "name": "Jackery",
+            "name": f"Jackery {device_sn}",
             "manufacturer": "Jackery",
             "model": "Energy Monitor",
         }
diff --git a/custom_components/jackery/translations/zh-Hans.json b/custom_components/jackery/translations/zh-Hans.json
index 8939c7e..da05d53 100644
--- a/custom_components/jackery/translations/zh-Hans.json
+++ b/custom_components/jackery/translations/zh-Hans.json
@@ -13,13 +13,11 @@
             }
         },
         "error": {
-            "already_configured": "该集成已配置",
-            "mqtt_not_configured": "MQTT 集成未配置或不可用。请先设置 MQTT 集成：设置 -> 设备与服务 -> 添加集成 -> MQTT",
-            "single_instance_allowed": "只允许一个此集成的实例"
+            "already_configured": "已配置相同序列号的设备",
+            "mqtt_not_configured": "MQTT 集成未配置或不可用。请先设置 MQTT 集成：设置 -> 设备与服务 -> 添加集成 -> MQTT"
         },
         "abort": {
-            "already_configured": "该集成已配置",
-            "single_instance_allowed": "只允许一个此集成的实例"
+            "already_configured": "已配置相同序列号的设备"
         }
     }
 }