The Zubi Flyer is the bomb dot com for makers: 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V. The onboard switch-mode boost regulator is designed to operate on 3 Volts. Power can be supplied from a 3 Volt CR123A battery or from a USB cable that provides regulated +5 Volts DC to the board. Do not run any power exceeding 5 Volts as the regulator cannot handle step-down voltage.