Is 'key fob' one word or two?

It is standardly written as two words: 'key fob'. Hyphenation ('key-fob') is sometimes seen when used as an attributive adjective (e.g., 'key-fob battery').

Can a key fob work without a battery?

Most modern electronic key fobs require a battery to transmit a signal. However, some contain a passive RFID chip for proximity reading that doesn't need a battery, and many car key fobs have a hidden mechanical key inside for backup.

What's the difference between a key fob and a remote?

A 'key fob' is the physical object you hold, often attached to keys. A 'remote' refers to the remote-control functionality. They are often used synonymously, as in 'key fob remote'.

What was the original meaning of 'fob'?

Historically, a 'fob' was a small pocket for a watch or a short chain/ribbon from which a watch was suspended. The term was later applied to small ornaments on keychains, which evolved into today's electronic devices.

key fob

UK/ˈkiː fɒb/US/ˈkiː fɑːb/

Informal, Technical

My Flashcards

Definition

Meaning

A small, portable device, often attached to a keyring, used for remote control or electronic access, such as to a car or building.

Any small, decorative token or ornament attached to a keychain; historically, a chain or ribbon from which a pocket watch was suspended. In modern contexts, it can refer to the physical device used in keyless entry systems.

Linguistics

Semantic Notes

The term's meaning has shifted from a decorative watch accessory to a primarily functional electronic device. It is often used interchangeably with 'keyless remote' or 'key fob remote', though the 'fob' specifically refers to the housing/object itself.

Dialectal Variation

British vs American Usage

Differences

Usage is largely identical, though American English more commonly uses 'key fob' for car remotes. British English may also use 'remote key' or 'plip' (brand-specific, informal).

Connotations

Neutral/functional in both varieties. The older, decorative sense is now archaic and rarely used.

Frequency

More frequent in American English due to earlier widespread adoption of keyless entry systems.

Vocabulary

Collocations

strong

car key fobelectronic key fobkey fob batteryreplace key fobkey fob remote

medium

lost my key fobattach to key fobkey fob accesskey fob programmer

weak

shiny key fobcompany key fobkey fob case

Grammar

Valency Patterns

VERB + key fob: press, click, use, replace, program, loseADJECTIVE + key fob: electronic, wireless, broken, new, spare

Vocabulary

Synonyms

Strong

keyless entry remotecar remote

Neutral

remote keykeyless remoteelectronic key

Weak

keychain remoteaccess dongle

Vocabulary

Antonyms

mechanical keytraditional key

Phrases

Idioms & Phrases

“[No common idioms for this specific term]”

Usage

Context Usage

Business

In property management, 'key fobs' are issued to tenants for building access.

Academic

Rare; might appear in papers on RFID technology or automotive security systems.

Everyday

Talking about locking/unlocking a car or getting into a secure office.

Technical

Refers specifically to the hardware device containing an RFID chip or radio transmitter for access control.

Examples

By Part of Speech

verb

British English

I need to fob my car? (Not used as a verb in modern English)

American English

He fobbed the door open. (Rare, non-standard; 'used his key fob' is correct)

adverb

British English

(No standard adverbial use)

American English

(No standard adverbial use)

adjective

British English

The key-fob battery is dead. (Hyphenated attributive use)

American English

She has a key fob accessory for her bag.

Examples

By CEFR Level

I have a key for my house.
This is my car key.

I lost the key fob for my car. I can't unlock it.
The key fob has two buttons: lock and unlock.

The new apartment building uses electronic key fobs instead of traditional keys for entry.
I had to get the dealership to program a replacement key fob, which was quite expensive.

Modern vehicle security systems integrate the transponder chip directly into the key fob housing, rendering hot-wiring obsolete.
The proliferation of RFID key fobs in commercial properties has raised new questions about data security and tracking.

Learning

Memory Aids

Mnemonic

Think: **FOB** = **F**inger **O**n **B**utton. You press a button on a key fob.

Conceptual Metaphor

A KEY FOB IS A MAGIC WAND (it performs actions remotely with a simple click).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Avoid translating as 'ключевой обман' (nonsense). The correct translation is 'брелок с дистанционным управлением', 'пульт от автосигнализации', or simply 'брелок-ключ'.
Do not confuse with 'fob' as in 'to fob off' (впарить, отделаться).

Common Mistakes

Misspelling as 'key phob' or 'key fob' (as two words is standard).
Using 'key fob' to refer to a USB drive on a keychain (incorrect).

Practice

Quiz

Fill in the gap

I pressed the button on my but the car doors didn't lock.

Multiple Choice

What is the PRIMARY modern function of a 'key fob'?

FAQ

Frequently Asked Questions

: It is standardly written as two words: 'key fob'. Hyphenation ('key-fob') is sometimes seen when used as an attributive adjective (e.g., 'key-fob battery').
: Most modern electronic key fobs require a battery to transmit a signal. However, some contain a passive RFID chip for proximity reading that doesn't need a battery, and many car key fobs have a hidden mechanical key inside for backup.
: A 'key fob' is the physical object you hold, often attached to keys. A 'remote' refers to the remote-control functionality. They are often used synonymously, as in 'key fob remote'.
: Historically, a 'fob' was a small pocket for a watch or a short chain/ribbon from which a watch was suspended. The term was later applied to small ornaments on keychains, which evolved into today's electronic devices.