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AJMRTC UPS HAT is an uninterruptible power supply expansion board built for Raspberry Pi series boards. It adopts smart power path management that allows charging the battery and powering your Raspberry Pi at the same time. When external power cuts off, the module automatically switches to battery backup power instantly. It provides stable 5V regulated output to keep your Raspberry Pi running continuously. The onboard multiple safety circuits prevent damage caused by abnormal power conditions. It directly stacks on Raspberry Pi GPIO header for simple assembly. Suitable for remote monitoring, data collection and other unattended embedded applications. Raspberry Pi and batteries are not included.