diff --git a/src-tauri/src/cmd/state.rs b/src-tauri/src/cmd/state.rs
index 9718464..373bd19 100644
--- a/src-tauri/src/cmd/state.rs
+++ b/src-tauri/src/cmd/state.rs
@@ -19,7 +19,8 @@ pub struct CentralState {
 pub struct PeripheralItem {
     pub id: PeripheralId,
     pub address: String,
-    pub represent: String,
+    pub represent: Option<String>,
+    pub is_unknown: bool,
     pub is_connected: bool,
     pub rssi: Option<i16>,
     pub battery: Option<i16>,
@@ -42,9 +43,8 @@ impl PeripheralItem {
         Self {
             id: periperial.id(),
             address: periperial.address().to_string(),
-            represent: properties
-                .and_then(|p| p.local_name.clone())
-                .unwrap_or(String::from("Unknown")),
+            represent: properties.and_then(|p| p.local_name.clone()),
+            is_unknown: properties.and_then(|p| p.local_name.clone()).is_none(),
             is_connected: periperial.is_connected().await.unwrap_or(false),
             rssi: properties.and_then(|p| p.rssi),
             battery: properties.and_then(|p| p.tx_power_level),
diff --git a/src/context/EstimContext.tsx b/src/context/EstimContext.tsx
index 55a0b84..044d5cc 100644
--- a/src/context/EstimContext.tsx
+++ b/src/context/EstimContext.tsx
@@ -19,18 +19,11 @@ type PeripheralItem = {
   id: string;
   address: string;
   represent: string | null;
+  isUnknown: boolean;
   isConnected: boolean;
   rssi: number | null;
   battery: number | null;
 };
-type DeviceState = {
-  id: string | null;
-  address: string | null;
-  represent: string | null;
-  isConnected: boolean | null;
-  rssi: number | null;
-  battery: number | null;
-};
 type BluetoothState = {
   ready: boolean | null;
   searching: boolean | null;
@@ -54,28 +47,14 @@ export const BleState = atomWithRefresh<BluetoothState>(async (get) => {
     connected: null,
   };
 });
-export const DeviceState = atomWithRefresh<DeviceState>(async (get) => {
+export const DeviceState = atomWithRefresh<PeripheralItem | null>(async (get) => {
   try {
     const state = await invoke('connected_peripheral_state');
-    return {
-      id: state?.id,
-      address: state?.address,
-      represent: state?.represent,
-      isConnected: state?.isConnected,
-      rssi: state?.rssi,
-      battery: state?.battery,
-    };
+    return state;
   } catch (e) {
     console.error('[refresh connected]', e);
   }
-  return {
-    id: null,
-    address: null,
-    represent: null,
-    isConnected: null,
-    rssi: null,
-    battery: null,
-  };
+  return null;
 });
 export const FoundPeripherals = atom(
   [] as PeripheralItem[],
diff --git a/src/page-components/state-bar/DeviceStates.tsx b/src/page-components/state-bar/DeviceStates.tsx
index 741827a..9746de4 100644
--- a/src/page-components/state-bar/DeviceStates.tsx
+++ b/src/page-components/state-bar/DeviceStates.tsx
@@ -9,8 +9,8 @@ const DeviceStates: FC = () => {
 
   return (
     <>
-      <IconRssi height={16} level={deviceState.rssi} />
-      <IconBattery height={16} level={deviceState.battery} />
+      <IconRssi height={16} level={deviceState?.rssi} />
+      <IconBattery height={16} level={deviceState?.battery} />
     </>
   );
 };