Arduino Pro Micro Leonardo compatible 3.3V 8MHz ATmega32U4 - TESTED

ATmega32U4 3.3V 8Mhz Pro Micro 5V 16MHz Board Module For Arduino/Leonardo ATMega 32U4 Controller Pro-Micro Replace Pro - AliExpress

3.3V 8M Pro Mini ATMEGA328P board compatible with Arduino -Buy Online India - KitsGuru

Pro Micro & Fio v3 Hookup Guide Datasheet by SparkFun Electronics

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Pro Micro - 3.3V/8MHz - DEV-12587 - SparkFun Electronics

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Micro ATmega32U4 (5V, 16MHz). Pins soldered. Compatible with Arduino Micro and Leonardo - Price history & Review, AliExpress Seller - RobotDyn Official Store

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1 x Mini Digispark Kickstarter ATTINY85 USB Development Micro Board Ar – eElectronicParts