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Micro-USB interface, Operating voltage: 5V, Input voltage: 7-12V. 9 channels of 10-bitADC, 5PWM pins, 12DIOs as well as hardware serial connections Rx and Tx. There is a voltage regulator on the board, so it can accept the voltage up to 12V DC. If you are a power board with unstable supply, you need to connect to "raw" and VCC pin Pro micro running at 5V/16MHz,supported under IDE v1.0.1. each one is in their own antiESD bag with 2 rows of header pins.