RFID vs. a Basic Push Button: One Starts Your Car, the Other Starts Anyone's

There are two products on the market wearing the same name, and the difference between them is the difference between a security upgrade and a security hole.

A basic push button start replaces your ignition switch with a button. Press it, the engine starts.

An RFID push button start replaces your ignition switch with a button that first checks whether you're authorized, and refuses to do anything if you aren't.

Both are sold as "push button start kits." Only one of them is an anti-theft device. The other quietly removes the one you had.

What a non-RFID kit actually does to your security

Think about what a mechanical key ignition really was. It was two things wearing one hat: a switch and a lock. Turning it started the car. The lock cylinder made sure only the person with the right key could turn it.

A bare push button kit replaces the switch and deletes the lock.

The result: the ignition of your vehicle is now a button that works for whoever presses it. If the button is on the dash, it's visible. If the installer hid it, you've traded a lock for the hope that nobody finds a switch — which is not security, it's a guessing game with one guess and no penalty for wrong answers.

On a classic car with no factory immobilizer, this is a straight downgrade. You started with a lock cylinder. Now you have a doorbell.

What RFID adds

RFID — Radio Frequency Identification — puts the lock back, in a form that can't be picked, drilled, or copied at a hardware store.

The module and the fob run a cryptographic conversation. The engine circuit stays physically immobilized until that conversation succeeds. The button becomes inert hardware — pressing it without an authorized fob present does nothing at all.

Digital Guard Dawg publishes exactly what runs that conversation:

· Texas Instruments® RFID chipsets

· DFDE — Dual Frequency ~ Dual Encryption communication

· Over 6 billion unique codes

Dual-frequency is the substantive part. A single-frequency system has one exchange to intercept. DFDE splits the exchange across two frequencies with two encryption layers — DGD's documentation describes this as blocking interception by "code grabbers."

And this is a named architecture from a named silicon vendor with a stated keyspace. Most competitors describe their encryption as "proprietary," which is a word, not a specification.

The comparison

	Basic push button	Factory key ignition	DGD RFID push button start
Starts with the button alone	❌ Anyone can	—	✅ Only with authorized fob
Engine immobilized when unauthorized	❌ No	⚠️ Only if factory immobilizer	✅ Yes
Credential can be copied	N/A — none needed	⚠️ Keys copy at any hardware store	✅ 6 billion codes, encrypted
Encryption architecture published	❌ None	Manufacturer-specific	✅ DFDE / TI RFID
Works with no factory immobilizer (pre-1998)	❌	❌	✅
Emergency access if credential lost	⚠️ It just starts	Locksmith / dealer	✅ Bypass card + PIN
One credential, many vehicles	❌	❌	✅ Unlimited DGD systems
Hands-free operation	❌	❌	✅ Passive proximity

Where this matters most: cars with no factory immobilizer

Modern cars usually have a factory transponder immobilizer, so a bare push button kit installed alongside it doesn't fully remove authentication.

Classics, hot rods, resto-mods, LS swaps, boats, ATVs, golf carts, and motorcycles frequently have none. On those vehicles the ignition lock cylinder was the entire theft protection, and a non-RFID button deletes it outright.

Which is precisely why RFID belongs on exactly the vehicles most likely to get a push button conversion — a six-figure resto-mod should not be protected by a button that works for everybody.

Digital Guard Dawg's classic-car systems build the immobilizer in:

· PBS-I — $589 — pre-1998, ignition only

· PBS-II — $665 — pre-1998 with power accessories, 5 output channels

· iKey Premier — $783 — classic or modern, adds PKE, alarm, optional remote start

All three include the immobilizer as a core function, not a paid add-on. (Prices as of July 2026.)

Two more things RFID gives you that a bare button never will

Hands-free operation

DGD's fobs are dual-mode — passive and active. In passive mode you don't touch anything: walk up and the system authenticates and authorizes the ignition; walk away and it re-arms and immobilizes automatically.

That last part is the security argument nobody makes loudly enough. It is impossible to forget to arm it. Every alarm ever sold depends on a human being remembering to press a button, and humans reliably don't. A system that arms itself the moment you walk away removes the failure mode entirely.

One credential for everything you own

A single DGD fob can be coded to operate every Digital Guard Dawg system you own — the hot rod, the bike, the boat, the golf cart, the UTV. One fob, one pocket.

Or don't carry a fob at all. The Watch Dawg ($199) hides the fob inside a wristwatch — compatible with the KIM, M1, AT-1, AT-1FX, PBS-M, PBS-MX, PBS-MXS, M24, GC12 and GC48 systems.

"But what if I lose the fob?"

The right question, and the one to ask before buying — because on some systems the honest answer is "call a tow truck."

Every DGD PBS and iKey system ships with two independent recovery paths:

6. Emergency Bypass Card — credit-card sized, lives in your wallet

7. User-programmable PIN code

DGD describes this feature as exclusive to their systems. Spare cards are $15. Spare fobs run $42–79 depending on the system, and fob batteries are standard replaceable lithium cells with about a one-year life.

The OEM-style fob even includes a hidden compartment for a "hide-a-key" blade.

RFID beats Bluetooth and phone-based systems too

A newer category of kits uses Bluetooth or a smartphone app as the credential. Convenient — but you've now made your ignition dependent on a phone that can go flat, get stolen, update its OS, lose an app, or drop off cellular.

DGD's FAQ makes the case directly: RFID operates on dedicated frequencies with hardware-level encryption, requiring no smartphone, no battery-draining app, and no cellular connectivity. A phone is a general-purpose computer running software you didn't write. An RFID fob is a sealed credential that does exactly one thing.

Want the immobilizer without changing your ignition at all?

Not every vehicle needs a push button conversion. If you just want the authentication layer, DGD sells the immobilizer standalone:

· DGD-M1 — $149 — hands-free RFID immobilizer for any 12V vehicle. Two wires plus power and ground. Silent, so no alarm battery drain.

· AT-1 — $229 — "one size fits all," 3-wire install, any 12V vehicle. Completely hidden once installed.

Keep your key. Add the lock back. From $149.

The one-sentence version

A basic push button start replaces a lock with a switch; an RFID push button start replaces a lock with a better lock — and then lets you stop carrying the key.

See RFID push button start systems → · See RFID anti-theft immobilizers →

Questions about your vehicle? 1-877-246-5395, M–F 7am–5pm Pacific.