S09 DC-DC Automatic Buck Boost Power Module Step Up and Down Board Input 3V-15V Output 3.3V/5V/4.2V/9V/12V Electronic DIY PCB
https://www.vogueparade.com/shopping/EN/4001/1/32909002977/s09-dc-dc-automatic-buck-boost-power-module-step-up-and-down-board-input-3v-15v-output-33v5v42v9v12v-electronic-diy-pcb//