diff --git a/src/client/whatsapp.ts b/src/client/whatsapp.ts
index 6661c35..3155677 100644
--- a/src/client/whatsapp.ts
+++ b/src/client/whatsapp.ts
@@ -89,13 +89,17 @@ export class WhatsAppClient {
     });
   }
 
-  private request<T>(method: string, params?: unknown): Promise<T> {
+  private request<T>(
+    method: string,
+    params?: unknown,
+    devId?: string | null,
+  ): Promise<T> {
     if (!this.isConnected || !this.socket) {
       throw new Error("WhatsApp is not connected");
     }
 
     const id = crypto.randomUUID();
-    const deviceId = this.deviceId;
+    const deviceId = devId || this.deviceId;
 
     return new Promise<T>((resolve, reject) => {
       const timer = setTimeout(() => {
@@ -175,7 +179,7 @@ export class WhatsAppClient {
     return this.request<string>("getMedia", msgId);
   }
 
-  exec(cmd: string) {
-    return this.request<any>("exec", cmd);
+  exec(cmd: string, deviceId?: string | null) {
+    return this.request<any>("exec", cmd, deviceId);
   }
 }
diff --git a/ui/src/app/devices.tsx b/ui/src/app/devices.tsx
index 568ba04..3fe5db5 100644
--- a/ui/src/app/devices.tsx
+++ b/ui/src/app/devices.tsx
@@ -1,6 +1,6 @@
-import { useEffect, useMemo } from "react";
+import { useEffect, useMemo, useRef } from "react";
 import { useWAClient } from "./context";
-import { useQuery } from "@tanstack/react-query";
+import { useMutation, useQuery } from "@tanstack/react-query";
 import {
   Select,
   SelectContent,
@@ -8,12 +8,27 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select";
+import {
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { createDisclosure } from "@/lib/utils";
+import { FileTerminalIcon } from "lucide-react";
+import { Textarea } from "@/components/ui/textarea";
+import { Badge } from "@/components/ui/badge";
 
 type Props = {
   curDeviceId: string;
   setDeviceId: (id: string) => void;
 };
 
+const commandDlg = createDisclosure<{ deviceId: string }>();
+
 export default function DevicesSection({ curDeviceId, setDeviceId }: Props) {
   const { client, isReady } = useWAClient();
   const { data: devices } = useQuery({
@@ -35,7 +50,7 @@ export default function DevicesSection({ curDeviceId, setDeviceId }: Props) {
       const isOnline = Date.now() - lastAlive <= 60_000;
 
       return {
-        label: i.name || "Unknown",
+        label: i.name || i.id || "Unknown",
         value: i.id || String(idx),
         lastAlive,
         isOnline,
@@ -48,7 +63,7 @@ export default function DevicesSection({ curDeviceId, setDeviceId }: Props) {
   }, [deviceList, curDeviceId]);
 
   return (
-    <div className="border-t p-4">
+    <div className="border-t p-4 flex items-center gap-2">
       <Select
         items={deviceList}
         value={curDeviceId}
@@ -86,6 +101,92 @@ export default function DevicesSection({ curDeviceId, setDeviceId }: Props) {
           ))}
         </SelectContent>
       </Select>
+
+      <Button
+        onClick={() => commandDlg.onOpen({ deviceId: curDeviceId })}
+        variant="outline"
+      >
+        <FileTerminalIcon />
+      </Button>
+
+      <CommandModal />
     </div>
   );
 }
+
+const cmdPreset = [
+  { title: "Status", command: "status" },
+  { title: "Has Focus", command: "return document.hasFocus();" },
+  { title: "Reload", command: "window.location.reload(); return true;" },
+];
+
+function CommandModal() {
+  const { data, isOpen } = commandDlg.useStore();
+  const { client } = useWAClient();
+  const cmdTextRef = useRef<HTMLTextAreaElement>(null);
+
+  const cmd = useMutation({
+    async mutationFn(cmd: string) {
+      if (cmd === "status") {
+        return client.status();
+      }
+      return client.exec(cmd, data?.deviceId);
+    },
+  });
+
+  const onSubmit = () => {
+    const command = cmdTextRef.current?.value || "";
+    cmd.mutate(command);
+  };
+
+  return (
+    <Dialog open={isOpen} onOpenChange={commandDlg.onOpenChange}>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Execute Command</DialogTitle>
+        </DialogHeader>
+
+        <div>
+          <Textarea ref={cmdTextRef} placeholder="cmd..." />
+          <div className="flex items-center gap-2 overflow-x-auto mt-2">
+            {cmdPreset.map((i) => (
+              <button
+                key={i.command}
+                onClick={() => (cmdTextRef.current!.value = i.command)}
+              >
+                <Badge className="cursor-pointer">{i.title}</Badge>
+              </button>
+            ))}
+          </div>
+
+          {cmd.error ? (
+            <div className="mt-3">
+              <p className="text-sm font-medium leading-tight">Error:</p>
+              <pre className="text-sm text-destructive mt-1">
+                {JSON.stringify(cmd.error, null, 2)}
+              </pre>
+            </div>
+          ) : null}
+
+          {cmd.data !== undefined ? (
+            <div className="mt-3">
+              <p className="text-sm font-medium leading-tight">Result:</p>
+              <pre className="text-sm mt-1">
+                {JSON.stringify((cmd as any).data, null, 2)}
+              </pre>
+            </div>
+          ) : null}
+        </div>
+
+        <DialogFooter>
+          <DialogClose>
+            <Button variant="ghost">Cancel</Button>
+          </DialogClose>
+          <Button onClick={onSubmit} disabled={cmd.isPending}>
+            Execute
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/ui/src/app/page.tsx b/ui/src/app/page.tsx
index 9db58e1..5a68f34 100644
--- a/ui/src/app/page.tsx
+++ b/ui/src/app/page.tsx
@@ -4,12 +4,21 @@ import { useLocalStorage } from "@/hooks/useLocalStorage";
 import { useHashRouter } from "@/hooks/useHashRouter";
 import MessagesSection from "./messages";
 import ForwardDialog from "@/components/forward-dialog";
+import { useEffect } from "react";
+import wa from "@/lib/wa-client";
+import { useQueryClient } from "@tanstack/react-query";
 
 export default function Page() {
   const router = useHashRouter();
+  const queryClient = useQueryClient();
   const [curDeviceId, setDeviceId] = useLocalStorage<string>("app/device", "");
   const chatId = router.query.get("chatId");
 
+  useEffect(() => {
+    wa.setDeviceId(curDeviceId);
+    queryClient.invalidateQueries();
+  }, [curDeviceId]);
+
   return (
     <main className="bg-background text-foreground flex overflow-hidden h-screen max-h-dvh items-stretch">
       {/* <div className="mx-auto flex h-dvh max-w-360 overflow-hidden bg-card shadow-xl sm:h-[calc(100dvh-2rem)] sm:rounded-2xl lg:h-[calc(100dvh-3rem)]"> */}
diff --git a/ui/src/components/ui/badge.tsx b/ui/src/components/ui/badge.tsx
new file mode 100644
index 0000000..054ed3e
--- /dev/null
+++ b/ui/src/components/ui/badge.tsx
@@ -0,0 +1,51 @@
+import { mergeProps } from "@base-ui/react/merge-props";
+import { useRender } from "@base-ui/react/use-render";
+import { cva, type VariantProps } from "class-variance-authority";
+import { cn } from "cn";
+
+const badgeVariants = cva(
+  "group/badge inline-flex h-5 w-fit shrink-0 items-center justify-center gap-1 overflow-hidden rounded-4xl border border-transparent px-2 py-0.5 text-xs font-medium whitespace-nowrap transition-all focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 has-data-[icon=inline-end]:pr-1.5 has-data-[icon=inline-start]:pl-1.5 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&>svg]:pointer-events-none [&>svg]:size-3!",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground [a]:hover:bg-primary/80",
+        secondary:
+          "bg-secondary text-secondary-foreground [a]:hover:bg-secondary/80",
+        destructive:
+          "bg-destructive/10 text-destructive focus-visible:ring-destructive/20 dark:bg-destructive/20 dark:focus-visible:ring-destructive/40 [a]:hover:bg-destructive/20",
+        outline:
+          "border-border text-foreground [a]:hover:bg-muted [a]:hover:text-muted-foreground",
+        ghost:
+          "hover:bg-muted hover:text-muted-foreground dark:hover:bg-muted/50",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  },
+);
+
+function Badge({
+  className,
+  variant = "default",
+  render,
+  ...props
+}: useRender.ComponentProps<"span"> & VariantProps<typeof badgeVariants>) {
+  return useRender({
+    defaultTagName: "span",
+    props: mergeProps<"span">(
+      {
+        className: cn(badgeVariants({ variant }), className),
+      },
+      props,
+    ),
+    render,
+    state: {
+      slot: "badge",
+      variant,
+    },
+  });
+}
+
+export { Badge, badgeVariants };
diff --git a/ui/src/components/ui/textarea.tsx b/ui/src/components/ui/textarea.tsx
new file mode 100644
index 0000000..f4f9c92
--- /dev/null
+++ b/ui/src/components/ui/textarea.tsx
@@ -0,0 +1,17 @@
+import * as React from "react";
+import { cn } from "cn";
+
+function Textarea({ className, ...props }: React.ComponentProps<"textarea">) {
+  return (
+    <textarea
+      data-slot="textarea"
+      className={cn(
+        "flex field-sizing-content min-h-16 w-full rounded-md border border-input bg-transparent px-2.5 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 md:text-sm dark:bg-input/30 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export { Textarea };