1、The development board has 20 digital input and output interfaces, 7 PWM interfaces and 12 analog input interfaces. 2、Using a separate USB-Serial converter chip compared to other versions, this product is innovative with a single-chip solution. Only one piece of Atmega32u4 was used to implement USB communication and control. This innovative design reduces costs. 3、Atmega32u4's native support for USB features also allows the development board to be modeled as a mouse and keyboard, greatly improving the application. 4、A new version for Arduno IDE 1.01 or higher is required to use for Arduno Leonardo. 5、Easy to operate, anti-aging, prolong service life. Features: 1. The development board has 20 digital input and output interfaces, 7 PWM interfaces and 12 analog input interfaces. 2. Using a separate USB-Serial converter chip compared to other versions, this product is innovative with a single-chip solution. Only one piece of Atmega32u4 was used to implement USB communication and control. This innovative design reduces costs. 3. Atmega32u4's native support for USB features also allows the development board to be modeled as a mouse and keyboard, greatly improving the application. 4. A new version for Arduno IDE 1.01 or higher is required to use for Arduno Leonardo. 5. Easy to operate, anti-aging, prolong service life. Specification: Condition: 100% Brand New Item Type: Development Board Controller: ATmega32u4 Working Frequency: 16 MHz Working Voltage: 5V Input Voltage (Recommended): 7-12V Digital IO Interface: 20 PWM Channel: 7 Analog Input: 12 5V Digital / Analog Interface Maximum Allowable Current: 40 mA 3.3V Digital / Analog Interface Maximum Allowable Current: 50 mA Flash Memory: 32 KB (ATmega32u4) of which 4 KB used by bootloader SRAM: 2.5 KB (ATmega32u4) EEPROM: 1 KB (ATmega32u4) Size: Approx. 68.6 x 53.3mm / 2.7 x 2.1in Package List: 1 x Development Board 1 x USB Cable