1. All IO ports leads to the classic 51 minimal system, eliminating the need for welding trouble
2. Integrated ISP 10P download interface, easy to download AT89S52 microcontroller.
3. Round hole socket, easy to replace the crystal (default with 11.0592M)
4. Support chip: STC89C52 STC12C5A60S2 STC11 / 10x series AT89S52 and chip compatible with the chip chip
5. A self-lock power switch
6. 2 power input ways: DC-005 power supply seat and single pin (next to the power switch)
7. 3 external expansion of VCC and GND
9. Reset mode: Power-on reset and external key reset.
10. IC lock seat, easy to replace the chip.
size: 4.1cm * 8.9cm
*chip is not included