Features: 1. Equipped with ATmega32U4 2. Added USB connection on board 3. Has 9-channel 10-bit ADC, 5 PWM pins, 12 and hardware serial connection RX and TX 4. Also has a voltage regulator, so it can accept up to 12 volts DC 5. The product is small Product parameters: Microcontroller: ATmega32U4 Working voltage: 3.3V Input voltage: DC 6-12V Flash: 32KB SRAM: 2.5KB EEPROM: 1KB Clock Speed: 16MHz Different batches may have different appearance, which does not affect use. color: Black Material: PC+metal Package Contents: 1 x development board module 2 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.