Declaration of Product Design Change

Over the past few months, because the price of ST chip(STM32F105RBT6 Cortex-M3) has increased greatly, and We're running out of stock, we have changed the design of most models and replaced them with ARTERY chips(AT32F415CBT7 Cortex-M4).AT chip supply is relatively stable, the product made of AT chip can maintain the original cost performance.At present, we still keep some models that still using ST chips, (example: SFR1M44-TU100K, SFRM72-TU100K, etc), but we are not sure how long it will last, because the price of ST chip continue rising.If you insist on buying the model using ST chip, you can order from the seller to produce the model still using ST chip. The price will be relatively high, and the production cycle will take about 2-4 weeks.In the future, if the price of ST chip is reduced and the supply is stable, we will continue to produce the model using ST chip.For customers who want to DIY by changing the firmware of our products, please note that you should confirm with the seller and purchase the model using ST chip.