Features: Powered by ATmega32U4 microcontroller with built in USB communication, this USB development board enables direct programming and data transfer without additional modules. Featuring a unique circular PCB design with sewing pad, it seamlessly integrates into wearable projects like smart clothing and interactive textiles for creative prototyping. Fully compatibles environment, this board simplifies wearable electronics development with accessible programming and extensive community resources. Compact and low power design includes pre installed control circuits, ideal for small scale wearable devices and fabric based electronic applications. Comes with header pins for flexible connection option choose between soldering for traditional prototyping or direct stitching for textile integration. Specifications: Main control chip: ATmega32U4 Size about 5.1x5.1cm/2.01x2.01in Communication: Comes with USB port, supports USB power supply and program upload Design form: circular PCB with sewn pad, suitable for wearable/fabric projects Development compatibility: fully compatible and supports ecologicaled development Power supply mode: USB power supply, or external power supply Accessories: Matching single row of pins, can be welded to expand connection as needed Package Includes: (1 Set) USB development board ATmega32U4 note: Please allow an error of 0-1cm due to manual measurement. Due to the difference of different monitors, the picture may not reflect the actual color of the item. Thanks!