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This small board comes in handy whenever you need a large amount of 5V power. Its size is comparable to that of a linear regulator, but it is actually a mini compressor! 2-5V DC input on one side and get 5V power and up to 1A on the other side. Very suitable for battery-powered projects using 2 or 3 alkaline batteries or a single lithium battery. This amplifier uses its very small but very thermally efficient TPS61023 chip. This chip incorporates almost all functions, including 3A dual MOSFET switches. After-Sales Service: Thank you for your purchase. If you have any problem, please contact us at any time. We promise satisfactory solutions within 24 hours.