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DC 4.5-40V To 5V 2A USB Charger DC-DC Step-down Buck Converter Voltmeter Module
This handy little unit is ideal to power your Pi from a DC battery source. Think solar power, caravan or your motor vehicle 12V battery. The 2A are more than adequate to power your Pi 1 or Pi 2. The unit feautures two pushbuttons. One to switch on the battery supply side and another to switch on the 5V USB A socket. The digital display measures the voltage on your DC battery supply to ensure you don't run the battery too low.
The unit can also used to charge your cellphone.