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Teensy (ATmega32u4 USB dev board) 2.0 [ATmega32u4] : ID 199 : $16.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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Teensy 2.0++ USB AVR Development Board ISP U Disk Keyboard Mouse Experimental Board AT90USB1286 Mega32u4 For Arduino - AliExpress
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Teensy 2.0++ USB AVR Development Board ISP U Disk Keyboard Experimental Board AT90USB1286 - Walmart.com
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