HW-133-v1.0 (often identified as a variant of the ultra-small DC-DC buck converter) is a popular, highly efficient step-down module favored in the hobbyist and DIY electronics community. www.daraz.com.bd
: Offers lower output ripple voltage, making it safer for sensitive microcontrollers. SARA-R5 series Hw-133-v1.0 Datasheet
Dry = High Voltage / Wet = Low Voltage.