Adjustable Current LED Driver, DC 3.3V 3.7V 5V LED Driver 30-1500mA Constant Current Adjustable Module for LED 18650 Li-ion: Amazon.com: Industrial & Scientific
Diameter 15.5MM 20MM 3W LED Q5 LED Emitter LED Flashlight Driver Board On Off One Mode 1.5 3.7V Input 700mA output Circuit Board|Portable Lighting Accessories| - AliExpress