DC-DC Boost module power is low and is useful for charging phones and other devices using a lower voltage. It can also be used to power other circuitry of development or plate for your program.

Specifications:

Input voltage: 0.9V - 5V;
Output voltage: 5V;
Current: depending on input voltage, output current can reach a maximum of 200mA - 600mA;
Efficiency: 94% max.

this Video in Russian but the reading of this item is clear.