This is mini PFM control DC-DC 0.9V-5V to USB (Universal Serial Bus) 5V step-up power supply module. Input voltage: 0.9
- 5V DC. Output voltage: 5V DC. On-board input voltage indicator. High conversion efficiency, maximum to 96%. Any DC voltage input 0.9V ~ 5V, output 5V DC voltage can be stable, with two AA batteries input to the output current of 500-600MA, single AA battery power supply output current about 200MA