Basically, Apple doesn't individually register serial numbers for accessories (mine was the Magic Trackpad). Instead, you get it replaced by referencing your computer's serial number. They don't seem to understand their own system on the phone either, because you cannot get through the voice prompts by saying your accessory name.
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Update your software and check your version of macOS
First, use Software Update to check for any new software your computer may need. After those updates are complete, check which version of macOS your computer has by choosing About This Mac from the Apple () menu.
Identify your device and its requirements
Learn about device names, descriptions, and minimum software requirements.
Apple wireless mice
Magic Mouse 2
Lightning connector, built-in battery
Requires OS X 10.11 or later
Apple Magic Mouse
Removable battery door, uses two AA batteries
Requires OS X 10.5.6 plus Wireless Mouse Software Update 1.0, or Mac OS X 10.6.2 or later
Apple Wireless Mighty Mouse
Multiple buttons, scroll ball
Requires OS X 10.4.8 or later
Apple Wireless Mouse
Single button
Requires OS X 10.2.6 or later
Apple wireless keyboards
Magic Keyboard with Numeric Keypad
Numeric keypad
Lightning connector, built-in battery
Requires macOS 10.12.4 or later
Magic Keyboard
Lightning connector, built-in battery
Requires OS X 10.11 or later
Apple Wireless Keyboard 2011
Uses two AA batteries
Exposé and Launchpad function keys:
Requires OS X 10.5.8 plus Aluminum Keyboard Update 2.0, or OS X 10.6.2 or later
The serial number of your Magic Mouse 2 is on the bottom surface of the device, along with other markings. It's a string of 17 letters and numbers.
Earlier wireless mice
You can find the serial number of earlier Apple wireless mouse models inside the device's battery bay:
Apple wireless keyboards
Magic Keyboard and Magic Keyboard with Numeric Keypad
The serial number of your Magic Keyboard is on the bottom surface of the device, along with other markings. It's a string of 17 letters and numbers.
Earlier wireless keyboards
You can find the serial number of earlier Apple wireless keyboard models on the underside of the device, near the power button:
Apple wireless trackpads
Magic Trackpad 2
The serial number of your Magic Trackpad 2 is on the bottom surface of the device, along with other markings. It's a string of 17 letters and numbers.
Earlier wireless trackpads
Apple Mouse Serial Numbers
You can find the serial number of earlier Apple wireless trackpad models on the underside of the device:
Learn more
Before you begin
You can find these numbers in several places, including Settings, on the physical device, in Finder or iTunes, and on the original packaging.
When you contact Apple for support, you can use the serial number or the IMEI/MEID number to identify your device.
Find your serial number, IMEI/MEID, or ICCID
Go to Settings > General and tap About.
Look for the serial number. You might need to scroll down to find the IMEI/MEID, and ICCID.
To paste this information into Apple registration or support forms, touch and hold the number to copy.
Still haven't found the number that you need? See the following sections.
iPhone
On these devices, find the serial number in Settings and the IMEI/MEID on the SIM tray. If you need support but you can't view the Settings menu, you can use the IMEI/MEID instead of the serial number:
iPhone 12
iPhone 12 mini
iPhone 12 Pro
iPhone 12 Pro Max
iPhone SE (2nd generation)
iPhone 11
iPhone 11 Pro
iPhone 11 Pro Max
iPhone XS
iPhone XS Max
iPhone XR
iPhone X
iPhone 8
iPhone 8 Plus
iPhone 7
iPhone 7 Plus
iPhone 6s
iPhone 6s Plus
On these devices, find the serial number in Settings and the IMEI/MEID (the MEID is the first 14 digits of the IMEI) on the back. If you need support but you can't view the Settings menu, you can use the IMEI/MEID instead of the serial number:
iPhone 6
iPhone 6 Plus
iPhone SE (1st generation)
iPhone 5s
iPhone 5c
iPhone 5
On these devices, find the serial number and IMEI/MEID on the SIM tray:
iPhone 3G
iPhone 3GS
iPhone 4 (GSM model)
iPhone 4s
If you have an original iPhone, find the serial number and IMEI engraved on the back.
Hp Mouse Serial Number Location
iPad and iPod touch
Find the serial number for your iPad Pro, iPad, or iPod touch on the back of the device. On an iPad (Wi-Fi + cellular model), you'll also find the IMEI.
Finder and iTunes
You can also find the serial number for your device in Finder or iTunes:
Connect your device to your computer.
On a Mac with macOS Catalina 10.15 or later, open the Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes.
Locate your device. In Finder, make sure you're under the General tab. In iTunes click the Summary tab to see its information.
For an iPhone, click Phone Number under your device name or the device model to find the IMEI/MEID and ICCID. For an iPad (cellular model), click Serial Number to find the CDN, IMEI/MEID, and ICCID.
If you'd like to paste this information into Apple registration or support forms,choose Edit > Copy Serial Number.
If you don't have your device
There are several places to check that might show the serial or IMEI/MEID number.
Go to appleid.apple.com in a web browser on your computer.
Sign in with the Apple ID that you use on your device.
Scroll down to the Devices section. To see the serial and IMEI/MEID number, select the device.
If you still need help, here's what to try next:
Do you have a different device with iOS 10.3 or later that's signed in to your Apple ID? On that device, go to Settings > [Your name]. Scroll down to see any devices signed in with your Apple ID. To view the serial and IMEI/MEID number, tap the device name.
Do you still have your device's original package? Find the serial number and IMEI/MEID on the barcode:
Still can't find the number that you need? Contact Apple Support by selecting your device from this list: