
Description from the supplier

DC DC 2V-5V to 5V 2A Step Up Boost Lion Battery Power Supply Module Lithium Voltage Converter Board
- Input voltage:2.0V-5.0V
- Output voltage:5V
- Output current:2A(max)
- PCB size:7*13mm
- SMD
- Conversion efficiency:95%


Own experience
Used for boosting 3 coin cells of a "Sound Machine". Result: the batteries last much shorter...
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