Dash cam hardwire kit Rearview Mirror Plug Cord - Install Three

In this review the Dash cam hardwire kit from SZFMSWE is examined for drivers who want a tidy, multi-device power solution for their vehicle. The bottom line: this hardwire cord is best for owners who need to power up to three accessories at once without relying on a bulky cigarette lighter adapter. It converts a rearview-mirror or overhead sensor power point into four USB modules and three device connectors, keeping wiring discreet while supplying both 12V and 5V outputs when the engine is running.

Key Features

• Universal fit: The cord is designed to tap power from common rearview mirror or overhead module points so it can work with a wide range of vehicles.
• Three-device installation: The harness has three connectors and four USB modules so users can run a dash cam, baby car camera and a portable Carplay screen at the same time.
• Mixed voltage outputs: Two 12V and two 5V USB modules provide the correct voltages for cameras and screens without extra converters.
• Multiple connector types: Six output wires including Type-C, Mic, Mini, DC3513, DC5525 and RJ11 cover many common power plugs used by car electronics.
• Neat wiring: Hardwiring behind the mirror or overhead area reduces clutter in the passenger compartment and gives a cleaner installation than external adapters.

Who It's For

The Dash cam hardwire kit is for drivers who want a professional-looking install for multiple car electronics without using a cigarette-lighter hub. It suits parents who run a baby car camera alongside a front dash cam and an aftermarket Carplay screen, and owners of vehicles with a powered rearview mirror, lane assist module, reading light or rain sensor to tap into.

This is not ideal for someone who needs continuous power while the vehicle is off, because the harness only supplies power when the engine is started. Also, installers who cannot access mirror or overhead wiring may prefer a different hardwire solution or professional installation service.

Pros & Cons

Pros

• Enables three devices to run simultaneously for a consolidated multi-camera or screen setup.
• Includes both 12V and 5V USB outputs to match camera and screen power requirements.
• Six output wire options cover many common connector types so fewer adapters are needed.

Cons

• Does not provide continuous power when the vehicle is off, so parking-recording or always-on accessories will not be supported.

Specifications

Brand	SZFMSWE
Power source	Rearview mirror/overhead module tap (red '+' black '-')
Outputs	4 USB modules (2x12V, 2x5V)
Device connectors	3 connectors, supports three devices
Wires / plugs included	Type-C, Mic, Mini, DC3513, DC5525, RJ11
Continuous power	Only active when vehicle is started

Our Verdict

The SZFMSWE Dash cam hardwire kit is a practical choice for anyone who wants a clean, consolidated power solution for multiple in-car devices. It saves dashboard space and simplifies wiring for dash cams, baby cameras and portable screens, though it is not suitable for always-on parking mode. For drivers who start their vehicle regularly and want a tidy install, it represents good value and flexibility.

Frequently Asked Questions

Can this kit power three devices at once?
Yes. The harness has three connectors and four USB modules (two 12V and two 5V) designed to run up to three devices simultaneously when the vehicle is running.

Will it give power when the car is off?
No. The hardwire cord only supplies power while the vehicle is started and does not provide continuous battery power when the engine is off.

Where does it get its power from?
The cord is meant to tap into the auto-dimming rearview mirror, lane assist, reading light or rain sensor power point, with the red wire as positive and black as negative.