Which end of cable is 5 volts input and which is 12 volts output?

5 volts is the USB-A input side. The output is on the barrel plug and is 12V.

I have a 5v/3a power bank that I'm planning to use to power up a 12v 1.5a monitor. Will this work?

The max output current for 12V is 1 amp. Your monitor requires 1.5 amps so technically the draw over the rating of the adapter and will not work.

Could this be used for audio equipment as a 12v trigger to activate (an amplifier) from another device that has USB but no trigger output?

Probably will work. I used a 5v usb connector in my car to feed this device. It gave me a 12 v output to supply a radar detector.

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FARSENSE USB DC 5V to 12V Step Up Power Cable(3FT),USB to DC 12V Adapter with DC Jack 5.5 x 2.5mm(Compatible with 5.5 x 2.1) and 3.5 x 1.35mm,USB Boost Converter Supports Voltage Display

FARSENSE USB DC 5V to 12V Step Up Power Cable(3FT),USB to DC 12V Adapter with DC Jack 5.5 x 2.5mm(Compatible with 5.5 x 2.1) and 3.5 x 1.35mm,USB Boost Converter Supports Voltage Display

Product ID: 574348261

Details

Colour
Black
Compatible devices
Only capable
Connector type
USB Type C
Item dimensions L x W x H
42 x 22 x 11
Specific uses for product
Speaker

⚡Boosts 5V USB to 12V DC output

🔋Max 1A current for stable power

🔌Dual compatible DC jack sizes

€ 31.64

Duties & taxes included

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Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power up smarter, not bulkier — your sleek 12V USB upgrade awaits!

SAFE PROTECTED - Built-in intelligent IC safeguards against over-current, over-voltage, and short circuits for peace of mind.
COMPACT POWER BOOST - Transforms any USB port into a reliable 12V power source, perfect for your low-power devices.
SMART VOLTAGE DISPLAY - Integrated voltage readout and on/off switch for effortless control and monitoring.
UNIVERSAL COMPATIBILITY - Supports 5.5x2.5mm & 3.5x1.35mm plugs, fitting a wide range of gadgets from LED lights to routers.
DURABLE FLEXIBLE BUILD - PVC sheath and pure copper core ensure longevity with over 10,000 bends without failure.

The FARSENSE USB DC 5V to 12V Step Up Power Cable is a compact, 3-foot adapter that converts standard 5V USB power to a stable 12V DC output at up to 1A. Featuring a built-in voltage display and on/off switch, it supports dual DC jack sizes (5.5x2.5mm and 3.5x1.35mm) and is designed with durable materials for long-lasting use. Ideal for powering low-wattage 12V devices like LED lights, routers, and speakers, it includes multiple safety protections to ensure reliable and secure operation.

Specifications

ASIN	B0CDTCXF8P
Brand	FARSENSE
Color	Black
Compatible Devices	Only capable of supplying power to 12V devices with power below 10W
Connector Type	USB Type C, 3.5mm Audio Jack
Current Rating	1 Amps
Customer Reviews	4.3 4.3 out of 5 stars (161)
Finish	Matte
Input Voltage	12 Volts
Item Dimensions	42 x 22 x 11 millimeters
Item Weight	39 Grams
Manufacturer	FARSENSE
Model Number	UC12-D
Nominal Power	10 Watts
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	Speaker
UPC	797430388739
Unit Count	1 Count

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