DROK 12V to 5V DC USB Buck Converter, Dual USB Port Fast Charger Board Auto Power Supply Adapter DC-DC 10-32V 12V 24V to 5V 9V Voltage Step Down

PARAMETER --- Input voltage DC 10-32V; Output voltage default 5V, after triggering quick charging, it will automatically adjusted at 3-12V. OUTPUT

DROK 12V DC Buck Converter, 8-35V to 3-27V 5A 135W Voltage Regulater Waterproof Adjustable 3V 5V 9V 12V 24V Power Supply Transformer Step-Down Volt Module Board for Car Auto Vehicle Motor Regulated

Setting Up the Buck Step-down Power Converter Module

Dc Buck Step Down Converter

5 PCS/LOT DC 12V Voltage Regulator/Power Supply Module DC 5V~32V 12V 24V to 12V 3A 36W Boost Buck Converter/Driver/Adapter - AliExpress

Digital Power Supply Module/Controller DC 6~60V to 0~50V 750W Voltage Regulator 15A Buck Converter/Adapter with Cooling Fan [200326] - $80.50 : Only Focus On China Brand Panel Meter, WonMeter.com

Car Buck Converter

USB Buck Converter

I want to have my power bank be backup power for my router, it runs at 5v already. Can I just join the wires of the power adapter and the power bank?

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Dual USB Charging Module

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DROK 12V to 5V DC USB Buck Converter, Dual USB Port Fast Charger Board Auto Power Supply Adapter DC-DC 10-32V 12V 24V to 5V 9V Voltage Step Down