UART 1 Development Board Module I2C 1 Development Board Module Micro-USB 1 Development Board Module Flash Memory 32KB, Of Which 4KB Is Used For Bootloader Sram 2.5 KB;Eeprom 1 KB Microcontroller: ATmega32u4 Clock Speed: 16mHz Working Voltage: 5V DC Digital I/O Pins: 10 PWM Channels: 4 Analog Input Channels: 5 Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:White Material: PCB Package Contents: 1 x Development Board Module 3 x Pin Header Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.