Great Step-up Module with 0.9-5V input, output 5V for many digital devices, so this is really a great module for designing a portable charger. Useful for your USB charger projects and onboard USB device supply solutions. (ie GoPro cameras)

You can supply it with single-cell LiPO or an AA size batter or others. Two AA batteries it can output current of 500 ~ 600MA, a single AA battery power supply can output 200ma current supply, great for mobile phones camera, single-chip, digital products supply.