Cheap And Discounts AT89C2051 4-bit Digital Electronic Clock Kit Module DIY Soldering Practice Soldering Skills YSZ-4 1.2mm Thick PCB FR-4 Board Wholesale. Buy Directly From Merchant Shop1103890168 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.