Feature: 1. This is a programmer expansion board that allows your board to modify fuse bits, burn-in bootstrap program to external chips and other boards. 2. On-board buzzer and LED indicator light, indicating whether burning is successful. 3. Card designers burn in batches.According to the OPEN-SMART user manual, it is very easy to use. 4. Using serial peripheral interface pin of the ICSP interface, and can be changed to a boot loader burner when it is directly plugged onto the two boards. 5. On-board buzzer, if the fuse position is changed successfully, it will emit a sound, and then it will make a sound again if the boot loader is burned properly.If it's not two beeps, the burning fails.You can listen to sounds instead of looking at LEDs, so this will improve recording efficiency. 6. On board LED indicator light, LEDs light up like breathing lights when they are normally energized. During programming, the PROG indicator light flashes until it is complete. If the program fails, the ERROR indicator light (red) will be on. 7. Onboard 28P lock seat for burning of the bootstrap program of Atmega 328P, Atmega 168P, Atmega 8. 8. Onboard ISP _ 6PIN interface for external board bootloader burning, or 10PIN interface 9. On board FT232RL and CH340G USB to TTL programmer interface, used to upload code to chip on 28P lock seat. Specification: Item Type: Programmer expansion board Operating Voltage: 5V Working Current: 500mA (maximum) Package List: 1 x Programmer Expansion Board