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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USB DC 5V to 12V Step Up Power Cable(3FT),USB C 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, Boost Converter Supports Voltage Display

Product ID: 571647749

Details

Color
Black
Compatible Devices
Only capable
Connector Type
USB Type C
Item dimensions L x W x H
1.65 x 0.86 x
Specific Uses For Product
Speaker

⚡Boosts 5V USB to 12V DC output

🔄Built-in switch & real-time voltage display

🔋Max 1A output current for stable power

₩28579

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Description

🔌 Elevate your power game—because your gear deserves the upgrade!

SAFETY FIRST ALWAYS - Advanced IC circuit protection guards against over-current, over-voltage, short circuits, and overheating, keeping your devices and workspace safe.
POWER UP YOUR DEVICES - Seamlessly converts standard 5V USB-C power to a reliable 12V output, perfect for your low-power gadgets under 10W.
SMART VOLTAGE CONTROL - Integrated switch and voltage display let you monitor and control power flow with a simple press—no more guesswork or wear from constant plugging.
PLUG PLAY CONVENIENCE - Compatible with multiple DC jack sizes (5.5x2.5mm & 3.5x1.35mm), this 3-foot cable is ready to power your mini fans, cameras, LED lights, and more—no tech degree required.
DURABILITY MEETS FLEXIBILITY - Premium pure copper core and flexible PVC sheath ensure fast conduction and withstand over 10,000 bends—built to last in your daily hustle.

The FARSENSE USB DC 5V to 12V Step Up Power Cable is a compact, 3-foot USB-C to DC adapter that boosts standard 5V USB power to a stable 12V output at up to 1A. Featuring a built-in switch and voltage display, it offers real-time control and monitoring. Designed with a pure copper core and flexible PVC sheath, it ensures durability and efficient conduction. Safety is prioritized with intelligent IC protection against electrical faults. Compatible with multiple DC jack sizes, it supports a wide range of low-power 12V devices, making it an essential power solution for professionals seeking reliable, portable power conversion.

Specifications

ASIN	B0CDTCXF8P
Best Sellers Rank	#65,363 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #245 in Power Converters
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 A
Customer Reviews	4.3 4.3 out of 5 stars (187)
Finish	Matte
Input Voltage	5 volts
Item Dimensions	1.65 x 0.86 x 0.43 inches
Item Weight	39 g
Manufacturer	FARSENSE
Mfr Part Number	UC12
Model Number	UC12-D
Nominal Power	10 watts
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	CEE 7/16 Europlug
Specific Uses For Product	Speaker
UPC	797430388739
Unit Count	1 Count
Warranty Description	1
Warranty Type	Limited

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