Solution · car & marine

The car keeps its look, loses the AUX cable.

Hardwired 12V Bluetooth for factory and classic car stereos — hands-free calls, engine-start reconnection, no dash mods.

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The car keeps its look, loses the AUX cable.

A hardwired Bluetooth receiver adds phone audio and hands-free calling to any car stereo with an aux input — including the factory head unit a classic car should keep. The receiver wires to switched 12V power and the aux/RCA input, hides behind the dash, and reconnects to your phone every time you start the engine.

It works in boats, ATVs and project cars too: anywhere 12V (or 24V) exists and a radio swap would ruin the original look. The blafili CAR even wakes the amplifier remotely through its remote-out wire when audio starts playing.

Factory look is the point Classic dashes stay original — the box hides behind the dash like a module, not a gadget.
Aux cables age badly Cables fall out, sockets wear. A paired radio link has no moving parts.
Calls need a mic Hands-free is a legal requirement — the module includes a mic and echo cancellation.

Three boxes, zero new cables.

Your phoneMusic + calls, paired to the car once
blafili CARSwitched 12V power · RCA/aux out · mic in
Factory head unitAux input, original knobs and look

Power that behaves

The difference between a clean install and a rattly one is the power tap. Ignition-switched 12V means the module sleeps when the key is off — no battery drain, no surprise reconnection loops at 3 a.m. A fuse tap on an accessory circuit keeps the factory loom intact and is the method we recommend over twisting into an existing wire. Boats and ATVs use the same receiver: 12–24V input covers both, and the module simply mounts somewhere dry.

Power that behaves The difference between a clean install and a rattly…

Sound and calls

Feed the head unit’s aux input with the supplied RCA or 3.5mm cable and keep the run short. The CAR’s Bluetooth 5.2 radio reconnects to the last phone at engine start, usually before you have closed the door. Calls route through the external mic — mount it at the A-pillar or visor aimed at the driver and let echo cancellation do its work. One wire worth understanding is the blue remote-out: it is an output, not an input, and it wakes a separated amplifier the moment audio starts, which is exactly what boat and classic-car builds with hidden amps need.

Sound and calls Feed the head unit’s aux input with the supplied…

The right box for this room.

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Why the CAR. BT 5.2 with multipoint, 12–24V input range for cars, trucks and boats, dual RCA output, a supplied mic for hands-free calls, and a remote-out wire that wakes the amplifier on playback. Install time: about ten minutes with the dash half off.

Set up once, forget the box.

  1. Tap switched power. Ignition-switched 12V (a fuse tap is cleanest) so the module sleeps with the car.
  2. Feed the aux input. RCA or 3.5mm into the head unit; keep the run short and away from the ignition coil.
  3. Mount the mic. A-pillar or visor, pointed at the driver — echo cancellation does the rest.
  4. Pair once, drive forever. The phone reconnects on engine start; your passenger can take over with one tap.

Owners in the same seat.

A
Amazon Customer
Sep 3, 2026
★★★★★★★★★★

Great retro-fit system

This is a great way to add blue-tooth to an existing system without the expensive of a full replacement. It is very easy to install, with clear and colour-coded cabling, reasonably compact unit so easy to find a place to tuck it away, and works great. Pairing is usual routine, sound quality is more than adequate for a car/boat and whole system works great - better than I expected.

blafili CAR Bluetooth 5.2 Receiver →
A
Amazon Customer
Sep 3, 2026
★★★★★★★★★★

Simple no frills way to add BlueToth to older still good radios

This is simple and low cost method to add Bluetooth capability to your older stereo player/car radio/ boat radio / caravan radio / truck radio / tractor radio etc. running on one battery (12V) or two batteries (24V).

Often it is much easier and cheaper, than to replace a still perfectly fine older radio system. Especially if it is a more complex or high quality installation, and you would have to pay a specialist to do the swap.

Another reason is if you do not want the looks of a phone like modern head unit, or do not have the space for it, or simply do not want to be bothered by unwanted and to you useless other features.

Or you simply want to add Bluetooth capability in an invisible hidden away fashion, thereby retaining the original vintage look of your vehicle. Especially if a rare and expensive original vintage radio is involved.

The installation of this Blafili is very simple, I would say right out foolproof.

The product is housed in a partly transparent plastic housing. In bright sunlight you can see through, and it is well made inside. I can recommend it.

blafili CAR Bluetooth 5.2 Receiver →
A
Amazon Customer
Sep 3, 2026
★★★★★★★★★★

Highly recommended

This is a good quality kit, containing a better than average bluetooth chipset. Ideal for a serious, built-in upgrade to any 12v audio system without resorting to janky accessories.

Easy to understand and install, bulletproof connection and operation, and excellent sound quality.

blafili CAR Bluetooth 5.2 Receiver →

Asked in this room.

How do I add Bluetooth to an old car stereo?

Wire a 12V Bluetooth receiver to switched power and the head unit’s aux input, mount the supplied mic, and pair your phone once — it reconnects every drive.

Will it drain the battery?

Not on switched power: the module sleeps when the ignition is off. A week of parking draws effectively nothing.

Does it work in a boat or ATV?

Yes — 12–24V input covers marine and powersport batteries; just mount the unit dry, behind the dash.

Can I keep the original radio?

That is the whole idea: the receiver feeds the factory aux input, so the original radio and its look stay untouched.

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