This item is an XL6009E1 DC-DC adjustable step-up boost converter module.
Input voltage range: 3V to 32V DC.
Output voltage range: 5V to 35V DC (adjustable).
Maximum current: 4 Amps (input), 2.5 to 3 Amps (recommended output).
Features: High-frequency switching technology (400 kHz) and a high-precision potentiometer for voltage adjustment.