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This mini DC-DC boost converter module supports input voltage from 0.9V to 5V, stably stepping up to standard 5V USB output. It can easily boost low voltage power such as 3V to 5V, perfect for single battery power supply conversion. Adopting high-efficiency boost circuit, it features stable performance, low heat and compact structure. Easy to wire and install, ideal for DIY USB chargers, portable power supplies, small smart devices, electronic experimental projects and low-voltage battery step-up applications.