DC to DC Converter 3.7V 5V to 3.3V Step Down Module 18650 Li-ion Battery for MCU Development Board Power Supply

features that you will surely need! This module has a lot of excellent functions. It is small and easy to operate, of course, it's safe. Do not hesitate to ask us for our recommendation to ensure the best possible feature and function that will work out for you!
Features:
Small size, convinent for carrying and storing.
Sufficient voltage and steady current.
Easy to operate and very safe.
Good in quality but inexpensive.
All the product will send after good package.
Widely-used, suitable for many kinds of electric appliances.