Wireless Trackball Keyboard N5901 2.4G,Mini USB Keyboard Multimedia Keyboard,Build-in 0.75 Inch Trackball
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2.4G Wireless Mini Keyboard Built in Wireless Trackball Mouse Multimedia Mouse and Keyboard Set 78 Keys for Windows Android Mac|Keyboards| - AliExpress
This Odd-Looking DIY Keyboard Features a Built-In Trackball - Hackster.io