The A-Star 32U4 Prime LV MicroSD is a programmable module from Pololu Robotics and Electronics that combines the advanced functionality of an AVR ATmega32U4 Microcontroller with a MicroSD card slot. This module can be used as a stand-alone controller or as an expansion board, allowing you to add a range of additional sensors, motors, and other components. Key features of the A-Star 32U4 Prime LV MicroSD include a 5V compatible ATmega microcontroller with 32KB of Flash Memory, 2.5KB of SRAM, 1KB of EEPROM, 20 I/O pins, 9 PWM outputs, 4 dedicated integrated 3-pin interface headers, and a 3V coin cell battery backup. It also has an onboard MicroSD card slot, giving you additional storage capacity for your applications. With its onboard 20MHz 8-bit processor and its versatility, the A-Star 32U4 Prime LV MicroSD is an ideal choice for applications in robotics, education, and prototyping.