diff --git a/package.json b/package.json
index 51dc22ec..a9a1d0ef 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "vite dev",
     "build": "vite build",
-    "deploy": "npm run build && gh-pages -d build",
+    "deploy": "npm run build && gh-pages -d build -t true",
     "preview": "vite preview",
     "check": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json --watch",
diff --git a/src/lib/serial/connection.js b/src/lib/serial/connection.js
index 9770b815..8bdfbd10 100644
--- a/src/lib/serial/connection.js
+++ b/src/lib/serial/connection.js
@@ -1,4 +1,5 @@
 import {writable} from "svelte/store"
+import {CharaDevice} from "$lib/serial/device.js"
 
 /** @type {import('svelte/store').Writable<import('./device.js').CharaDevice>} */
 export const serialPort = writable()
@@ -11,3 +12,21 @@ export const chords = writable([])
 
 /** @type {import('svelte/store').Writable<boolean>} */
 export const syncing = writable(false)
+
+/** @type {CharaDevice} */
+let device // @hmr:keep
+
+export async function initSerial() {
+  syncing.set(true)
+  device ??= new CharaDevice()
+  serialPort.set(device)
+
+  const chordCount = await device.getChordCount()
+  const chordInfo = []
+  for (let i = 0; i < chordCount; i++) {
+    chordInfo.push(await device.getChord(i))
+  }
+  chordInfo.sort(({phrase: a}, {phrase: b}) => a.localeCompare(b))
+  chords.set(chordInfo)
+  syncing.set(false)
+}
diff --git a/src/lib/serial/device.js b/src/lib/serial/device.js
index 90570c7d..8e1431a3 100644
--- a/src/lib/serial/device.js
+++ b/src/lib/serial/device.js
@@ -2,6 +2,15 @@ import {LineBreakTransformer} from "$lib/serial/line-break-transformer.js"
 import {serialLog} from "$lib/serial/connection.js"
 import {ACTION_MAP} from "$lib/serial/webserial/constants/action-map.js"
 
+export const VENDOR_ID = 0x239a
+
+/**
+ * @returns {Promise<boolean>}
+ */
+export async function hasSerialPermission() {
+  return navigator.serial.getPorts().then(it => it.length > 0)
+}
+
 export class CharaDevice {
   /** @type {Promise<SerialPort>} */
   #port
@@ -26,7 +35,9 @@ export class CharaDevice {
    */
   constructor(baudRate = 115200) {
     this.#port = navigator.serial.getPorts().then(async ports => {
-      const port = ports.find(it => it.getInfo().usbVendorId === 0x239a)
+      const port =
+        ports.find(it => it.getInfo().usbVendorId === VENDOR_ID) ??
+        (await navigator.serial.requestPort({filters: [{usbVendorId: VENDOR_ID}]}))
       await port.open({baudRate})
       const info = port.getInfo()
       serialLog.update(it => {
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 91fc325e..1d2bfb61 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -4,11 +4,8 @@
   import {onMount} from "svelte"
   import {applyTheme, argbFromHex, themeFromSourceColor} from "@material/material-color-utilities"
   import Navigation from "$lib/components/Navigation.svelte"
-  import {chords, serialPort, syncing} from "$lib/serial/connection.js"
-  import {CharaDevice} from "$lib/serial/device.js"
-
-  /** @type {import('$lib/serial/device.js').CharaDevice} */
-  let device // @hmr:keep
+  import {hasSerialPermission} from "$lib/serial/device.js"
+  import {initSerial} from "$lib/serial/connection.js"
 
   onMount(async () => {
     const theme = themeFromSourceColor(argbFromHex("#6D81C7"), [
@@ -17,18 +14,7 @@
     const dark = true // window.matchMedia("(prefers-color-scheme: dark)").matches
     applyTheme(theme, {target: document.body, dark})
 
-    syncing.set(true)
-    device ??= new CharaDevice()
-    serialPort.set(device)
-
-    const chordCount = await device.getChordCount()
-    const chordInfo = []
-    for (let i = 0; i < chordCount; i++) {
-      chordInfo.push(await device.getChord(i))
-    }
-    chordInfo.sort(({phrase: a}, {phrase: b}) => a.localeCompare(b))
-    chords.set(chordInfo)
-    syncing.set(false)
+    if (await hasSerialPermission()) await initSerial()
   })
 </script>
 
diff --git a/src/routes/device-manager/+page.svelte b/src/routes/device-manager/+page.svelte
index 30197de1..bf0fcea1 100644
--- a/src/routes/device-manager/+page.svelte
+++ b/src/routes/device-manager/+page.svelte
@@ -1,6 +1,7 @@
 <script>
-  import {serialPort} from "$lib/serial/connection.js"
+  import {initSerial, serialPort} from "$lib/serial/connection.js"
   import Terminal from "$lib/components/Terminal.svelte"
+  import {browser} from "$app/environment"
 </script>
 
 <svelte:head>
@@ -11,15 +12,15 @@
 
 <div class="device-grid">
   <div class="row">
-    <button class="secondary">
-      {#if $serialPort}
-        <span class="icon">usb_off</span> Disconnect
-      {:else}
-        <span class="icon">usb</span> Connect
-      {/if}
-    </button>
-    <button title="Reboot" class="icon">restart_alt</button>
-    <button class="icon" title="Reboot to bootloader">rule_settings</button>
+    {#if $serialPort === undefined}
+      <button class="secondary" disabled={browser && !("serial" in navigator)} on:click={initSerial}>
+        <span class="icon">usb</span>Pair
+      </button>
+    {/if}
+    <button title="Reboot" class="icon" disabled={$serialPort === undefined}>restart_alt</button>
+    <button title="Reboot to bootloader" class="icon" disabled={$serialPort === undefined}
+      >rule_settings</button
+    >
   </div>
   <div class="terminal">
     <Terminal />