# Device Management

{% hint style="info" %}
A device is a customer's mobile device (for mobile push) or mobile/web browser (for web push) that has subscribed to push notifications.
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**All Devices** provides a comprehensive list of subscribed devices, along with detailed information about each device. 

This information includes basic details such as platform type, push opt-in date, and last updated date. Additionally, by integrating [User ID](/data-integration/user-id.md) and [Tags](/data-integration/tags.md), you can enhance the dataset and further segment your customers. This will allow you to personalize your messages and target specific user groups more effectively.

<figure><img src="/files/tBnwJCZ34hIBm4U4PAUo" alt="FlareLane All Devices page showing comprehensive list of devices that have subscribed to push notifications"><figcaption></figcaption></figure>

## Data Collected by FlareLane SDK

After a user subscribes to push notifications, FlareLane's SDK automatically captures certain data. Using this data, you can segment the devices.

<table><thead><tr><th width="199">Terms</th><th>Definitions</th></tr></thead><tbody><tr><td><strong>Device ID</strong></td><td>Unique identifier assigned to a device that allows it to be distinguished from other devices</td></tr><tr><td><strong>Last Accessed</strong></td><td>The time the device last accessed the app or website</td></tr><tr><td><strong>Opt-in Status</strong></td><td>Indicates that the device is actively subscribed to receive push notifications and is capable of receiving messages</td></tr><tr><td><strong>Platform</strong></td><td>The device model name and the OS version</td></tr><tr><td><strong>Push Opt-in</strong></td><td>The time the device initially subscribed to push notifications and is successfully added to the project</td></tr><tr><td><strong>SDK Version</strong></td><td>Current SDK version</td></tr></tbody></table>

## Detecting Unsubscribes

If a device deletes the app, FlareLane recognizes that the device has unsubscribed.

You can verify a device's subscription status at the 'Opt-in' column. If there is a checkmark, it means the device is subscribed, and if there isn't a checkmark, it means the device has unsubscribed.

## Adding Test Devices

Add specific devices as test devices and send test messages.

1. Select a device and click **\[···]** on the right
2. Click 'Add to Test Device' and name the test device
3. Go to **Test Devices** and the selected device will now be listed as a test device

<figure><img src="/files/krN1kCPmjxxCZ0dA0EmW" alt="FlareLane All Devices page showing how to add a device as a test device"><figcaption></figcaption></figure>

<figure><img src="/files/asmYfo1oseprGXIfW5KF" alt="FlareLane Test Devices page showing that a device has been added as a test device"><figcaption></figcaption></figure>


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