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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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PJRC Teensy 4.0 USB Development Board : ID 4323 : $23.80 : Adafruit Industries, Unique & fun DIY electronics and kits
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