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Charge the batteries in your Mac Pro accessories
Your Magic Keyboard with Numeric Keypad, Magic Mouse, and Magic Trackpad each have a built-in rechargeable battery.
Check the battery level. Click the Control Center icon 
in the menu bar, click the Bluetooth icon 
, then choose the device.
Charge the battery. Connect your Magic Keyboard with Numeric Keypad or Magic Mouse (or optional Magic Trackpad) to your Mac Pro with the included USB-C to Lightning Cable.
Learn more. See Disposal and recycling information or visit Apple Lithium-ion Batteries.