Function useSystemHardware

Returns {
    bluetoothEnabled: Writable<boolean>;
    cellServiceEnabled: Writable<boolean>;
    charge: Writable<number>;
    isBluetoothDiscoverable: Readable<boolean>;
    notificationTone: Writable<string>;
    notificationToneChoices: Readable<readonly RingtoneOption[]>;
    ringMode: Writable<RingMode>;
    ringModeChoices: Readable<readonly RingModeChoice[]>;
    ringtone: Writable<string>;
    ringtoneChoices: Readable<readonly RingtoneOption[]>;
    signalLevel: Writable<number>;
    soundMuted: Writable<boolean>;
    soundVolume: Writable<number>;
    volumeStep: Writable<number>;
    volumeStepChoices: readonly [1, 2, 5, 10, 20];
}

• bluetoothEnabled: Writable<boolean>

• cellServiceEnabled: Writable<boolean>

• charge: Writable<number>

• isBluetoothDiscoverable: Readable<boolean>

• notificationTone: Writable<string>

  MICA-256: the tone a notification plays.

• notificationToneChoices: Readable<readonly RingtoneOption[]>

  The owner's sounds only. 'default' (the phone's own notification tone) is always a valid notificationTone and is deliberately not listed, so a caller renders it in its own language (Settings prepends a translated "Default" row).

• ringMode: Writable<RingMode>

  The ringer switch: 'normal' | 'vibrate' | 'silent'. MICA-62.

• ringModeChoices: Readable<readonly RingModeChoice[]>

  The choice lists are readable wrappers rather than the bare arrays, and that is a transport decision, not a second source of truth — shell/state/audio.ts still owns the one list. A plain value on a facet has to be hand-carried through AddOnConstants (as volumeStepChoices is, because the first paint needs it synchronously); a store rides the generic subscribe path an iframe twin already has. Nothing renders a ringer picker before hydration, so the store is the cheaper half of that trade.

• ringtone: Writable<string>

• ringtoneChoices: Readable<readonly RingtoneOption[]>

  The built-in tones, then the owner's sounds (MICA-256).

• signalLevel: Writable<number>

• soundMuted: Writable<boolean>

• soundVolume: Writable<number>

• volumeStep: Writable<number>

  How far one physical volume-button press moves the volume, in whole percent.

• volumeStepChoices: readonly [1, 2, 5, 10, 20]