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 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

FARSENSE 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

🔋Max 1A output current for stable power

🔌3FT cable with dual compatible DC jacks

2966 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power Up Your Gear with Confidence — Never Settle for Less!

SAFETY FIRST DESIGN - Built-in intelligent IC protects against over-current, over-voltage, short circuits, and overheating for peace of mind.
POWER BOOST ON DEMAND - Seamlessly steps up your USB 5V to a reliable 12V output, perfect for low-power 12V devices under 10W.
PREMIUM BUILD QUALITY - Pure copper core and flexible PVC sheath ensure fast conduction and durability with 10,000+ bend lifespan.
UNIVERSAL COMPATIBILITY - Supports 5.5x2.5mm & 3.5x1.35mm DC jacks, compatible with a wide range of gadgets from cameras to LED lights.
SMART VOLTAGE DISPLAY SWITCH - Integrated voltage readout and on/off switch reduce wear and give you full control at a glance.

The FARSENSE USB DC 5V to 12V Step Up Power Cable is a compact, 3-foot USB-C to DC adapter that converts standard 5V USB power into a stable 12V output at up to 1A. Featuring a built-in voltage display and on/off switch, it offers enhanced control and durability with a pure copper core and flexible PVC sheath. Designed for low-power 12V devices under 10W, it supports multiple DC jack sizes and includes advanced safety protections, making it an essential power solution for professionals seeking reliable, portable voltage boosting.

Specifications

ASIN	B0CDTCXF8P
Best Sellers Rank	#70,361 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #282 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	4.4 4.4 out of 5 stars (180)
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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TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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2966 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews