What Windows Dynamic Lock Actually Does with Bluetooth Devices

Supported Devices: What Can You Use With Dynamic Lock?

Most modern smartphones work with Dynamic Lock, including iPhones and Android devices, as long as they pair with the computer using standard Bluetooth 🔷. Windows relies on that Bluetooth link to judge how far away the phone is. When the signal drops as you walk away, Windows locks the screen.

Other Bluetooth 🔷 devices, such as fitness trackers, smartwatches, or wireless headphones, can also be paired. They only help if they keep a steady, reliable connection to the computer. A phone is usually the safest choice because you carry it everywhere. Headphones that you leave on the desk will keep the PC unlocked after you leave. Test any other device before you rely on it.

If your computer has no built-in Bluetooth 🔷, plug in a compatible USB Bluetooth adapter first. Windows should then show the Bluetooth toggle in Settings. If you don’t see it, check that the adapter’s driver installed correctly.

Step-by-Step Guide: How to Enable Dynamic Lock on Windows

Setup takes a few minutes once the prerequisites are in place. There are two parts. First you pair the phone, then you switch on the Dynamic Lock option.

Step 1Pair Your Bluetooth Device

Dynamic Lock needs a phone that Windows already knows about, so pair it through Settings first. The steps below are for Windows 11. Windows 10 uses slightly different names, noted in step 4.

1. On your phone, turn on Bluetooth and leave the Bluetooth settings screen open so the phone is discoverable.
2. On your PC, open the Start menu and click Settings (the gear icon).

3. 

4. Click Bluetooth & devices in the left-hand list. In Windows 10, click Devices instead. You should see the Bluetooth settings page.
5. Turn the Bluetooth toggle On if it is off.
6. Click Add device, then choose Bluetooth in the window that opens. Windows starts searching for nearby devices.
7. Select your phone from the list. If Windows and your phone both show a pairing code, check that the codes match and confirm on both devices.
8. Wait for Windows to report that the device is Connected or paired. Your phone should now appear in the device list.

If your phone does not show up, make sure its Bluetooth settings screen is still open and that it is within a metre or two of the PC. Then click Add device again.

Step 2Turn on Dynamic Lock

Once the phone is paired, you can turn on Dynamic Lock from the Accounts section of Settings. If no phone is paired, the option stays grayed out. That is the most common reason people can't find it or click it.

1. Open the Start menu and click Settings.
2. Click Accounts.
3. Click Sign-in options. You should see the list of sign-in methods, such as PIN, password, and Windows Hello.
4. Scroll down to the Dynamic lock section. If it is not visible, expand Additional settings or scroll further. Its exact position varies a little between Windows builds.
5. Check the box labeled Allow Windows to automatically lock your device when you're away.
6. Let Windows finish. It detects your paired phone automatically and uses it as the anchor device. You do not need to restart the PC.

To test it, sign in, then walk away with your phone and give it a minute. The PC should lock once the Bluetooth signal drops. The range depends on walls and interference, so the distance varies from room to room.

Removing the phone from Bluetooth & devices also stops Dynamic Lock from working, because the feature needs a paired device.

Summary

Dynamic Lock is a built-in Windows security feature that protects your privacy by locking the screen when you leave. It works by watching the Bluetooth signal between your PC and a paired device, usually your phone. When that signal gets too weak, Windows locks the computer.

It is a convenience layer, not a replacement for good habits. If your phone stays in range, or if its Bluetooth is on and connected from another room, the PC may stay unlocked longer than you expect. In shared spaces, press Windows key + L when you leave your desk.