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No battery, no code, no neighbor kept out

Cat Mate 04170257 collar magnets, 2 pack

Two collar magnets for Cat Mate electromagnetic flaps, at $7.00 each — the simplest key on this shelf and the least selective.

Cat Mate pack of two collar magnets for electromagnetic cat flaps

Cat Mate 04170257 collar magnets, 2 pack

Two collar magnets for Cat Mate electromagnetic flaps, at $7.00 each — the simplest key on this shelf and the least selective.

Magnets in the pack
2
Price per magnet
$7.00
Technology
Magnetic — not RFID
Power
None
Weight
27 g (1 oz) for the pair
Stated compatibility
Cat Mate electromagnetic cat flaps
Selectivity
None — any matching magnet opens the flap
Magnet strength
Not published
Amazon reference
B0002DHNJQ
EAN
0035368702570
  • Nothing to pair, nothing to charge and nothing to go out of date
  • No serial number threshold and no firmware generation to check
  • No selectivity — a neighbor’s cat wearing any matching magnet gets in

Best for: A Cat Mate electromagnetic flap where simplicity matters more than selectivity

Check price on Amazon

Specifications

Magnets in the pack
2
Price per magnet
$7.00
Technology
Magnetic — not RFID
Power
None
Weight
27 g (1 oz) for the pair
Stated compatibility
Cat Mate electromagnetic cat flaps
Selectivity
None — any matching magnet opens the flap
Magnet strength
Not published
Amazon reference
B0002DHNJQ
EAN
0035368702570

What you are getting

Two collar magnets for Cat Mate electromagnetic cat flaps. $13.99 — $7.00 a key. Twenty-seven grams for the pair.

A magnet is not an RFID tag, and that is the whole point

The other two keys on this shelf are radio: one passive, one battery-powered. This is a magnet, and an electromagnetic flap is a different machine — a magnet on the collar swings a latch mechanically as the cat’s head reaches the flap.

What that buys: nothing to pair, nothing to charge, nothing to go out of date. A magnet has no electronics to fail and no serial number to be above. What it costs: no selectivity. Any magnet of the right strength opens the flap, including the neighbor’s cat wearing one.

RFID doors read a unique code; a magnetic flap reads a field.

Where it belongs

Cat Mate electromagnetic flaps, and this shelf already publishes the Cat Mate C200 among the doors. It is the oldest of the three systems here and the simplest.

What is not published

No magnet strength, no range, and no model list beyond “electromagnetic cat flaps”. The listing is one line long — the shortest page on this shelf.

Availability

Read on the day this page was built: $14 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.

The questions owners ask

Does a magnet keep other cats out?

Not reliably. An electromagnetic flap responds to a field, not to a code: any magnet of the right type and strength on any collar will open it. RFID doors read a unique number per tag, which is why they can be told to admit one animal and refuse another. If a neighbor’s cat is the problem, a magnet is the wrong key.

Why choose a magnet at all, then?

Because there is nothing to go wrong. No battery to replace every three to six months — which is what the PetSafe key on this shelf needs — no pairing, no serial-number generation to check, and nothing that stops working when a battery dies at the wrong moment. On an electromagnetic flap it is the only key that exists, and it is the cheapest per unit after the Manruta pair.

Will it work on a microchip flap?

No. A microchip or RFID flap reads a radio code and ignores magnetism entirely. This pack is for Cat Mate electromagnetic flaps, which are a different generation of door. The three keys on this shelf cover three incompatible systems: magnet here, passive RFID at Manruta, powered RFID at PetSafe.

Products this fits

More door tags & tunnels

  • PetSafe electronic pet door RFID collar key with battery

    PetSafe PAC19-15793 Electronic Pet Door Key

    A powered RFID key for PetSafe Electronic Pet Doors, battery included, stated to last three to six months and not to work with the SmartDoor Plus.

    Keys in the pack
    1
    Price per key
    $24.93
    Technology
    Powered RFID
    Battery
    RFA-67, included
    Battery life
    3 to 6 months, depending on use
    Stated compatibility
    All sizes of the PetSafe Electronic Pet Door
    Stated incompatibility
    SmartDoor Plus
    Pets per door
    Up to 5
    Collar fit
    Fits most collar ID tags
    Weight
    20 g (0.7 oz)
    Read range
    Not published
    Amazon reference
    B000WJ0IGU
    EAN
    729849110458
    • Names the one door in its own range that it will not open
    • Battery included, and the part number given — RFA-67 — so a replacement can be found
    • The most expensive key here at $24.93, and sold singly where the others come in pairs

    Best for: A PetSafe Electronic Pet Door, as a replacement key or a second animal

    Check price on Amazon
  • Manruta pair of blue round RFID microchip collar tags for pets

    Manruta MRT RFID collar tag, 2 pack

    Two waterproof epoxy RFID collar tags for SureFlap and SureFeed, at $5.50 each — with a stated serial-number cutoff and a stated incompatibility.

    Tags in the pack
    2
    Price per tag
    $5.50
    Diameter
    1.1 in
    Weight
    2.8 g (0.1 oz) each
    Material
    Waterproof epoxy
    Power
    None — passive RFID
    Stated compatibility
    SureFlap Microchip Pet Door, Cat Door, DualScan Cat Door, SureFeed feeder
    Serial threshold
    Cat Door serial numbers above 1152201
    Stated incompatibility
    PetSafe products
    Read range
    Not published
    Amazon reference
    B07T5D43RQ
    EAN
    0717877418370
    • Publishes a serial-number threshold, which can be checked on the door you already own
    • Writes down the brand it will not work with, in its own capitals
    • No read range published

    Best for: A SureFlap door whose cat has no readable chip, or a second animal to add

    Check price on Amazon
  • Sure Petcare RFID collar tag for microchip cat flaps

    Sure Petcare RFID collar tag

    An RFID tag for the collar, working with SureFlap microchip flaps and pet doors, SureFeed microchip feeders and Felaqua Connect — the fallback when a chip reads badly.

    Works with
    All SureFlap microchip cat flaps and pet doors, SureFeed microchip feeders, Felaqua Connect
    Function
    Selective access without relying on the implanted chip
    Amazon reference
    DE B00B5BEK54 · US B018F2HSFO · GB B018F2HSFO · FR B018F2HSFO · IT B018F2HSFO · ES B018F2HSFO
    EAN
    5060180390341
    • Solves the one failure mode of a microchip door — a chip that has migrated or reads intermittently
    • Works across the whole Sure Petcare range, including the feeders
    • It hangs on a collar, and collars come off — which is the problem chips were meant to solve

    Best for: A cat whose chip the door reads unreliably — and as a spare before that happens.

    Check price on Amazon

Elsewhere in the cupboard

  • Bengor twenty-four piece cat fountain filter and sponge set with cleaning brush

    Bengor A-065-06, 24-piece set

    A 24-piece filter and sponge set with a pump brush at $1.25 a filter, whose title and first bullet state different fountain capacities.

    Filters
    12
    Sponges
    12
    Brush
    1, for the pump
    Price per filter
    $1.25
    Filter size
    3.9 × 3.9 × 0.4 in
    Sponge size
    1.5 × 1.1 × 1.0 in
    Capacities in the title
    50 oz, 84 oz, 95 oz, 108 oz
    Capacities in the first bullet
    95 oz / 2.8 L, 67 oz / 2 L, 135 oz / 4 L
    Layers
    Non-woven fabric, activated carbon, ion exchange resin
    Change interval
    Every 2 to 4 weeks
    Amazon reference
    B0GVY2YFNT
    EAN
    0792936231404
    • Publishes both filter and sponge dimensions, which is what settles fitment
    • Eight cents a filter cheaper than the identically configured Porens set
    • The title and the first bullet name different fountain capacities

    Best for: A 95 oz / 2.8 L fountain, where the measured dimensions settle the fit

    Check price on Amazon
  • Cirfifth twelve-pack of cat water fountain replacement carbon filters

    Cirfifth 001, 12 pack

    Twelve individually sealed carbon filters for 84 oz / 2.5 L round fountains, explicitly not for Catit, with a 12-month warranty.

    Filters
    12
    Sponges
    None — filters only
    Price per filter
    $1.17
    Stated fitment
    84 oz / 2.5 L round fountains
    Stated incompatibility
    Catit brand fountains
    Layers
    Cotton, activated carbon, ion exchange resin
    Packaging
    Individually sealed
    Warranty
    12 months
    Change interval
    Every 2 to 4 weeks
    Filter dimensions
    Not published
    Amazon reference
    B08Y734789
    EAN
    0721223137631
    • The only set on this shelf for the 84 oz / 2.5 L fountain
    • Filters only, with no sponges padding the count
    • No filter dimensions published, so fitment rests on the capacity alone

    Best for: An 84 oz / 2.5 L round fountain that is not a Catit

    Check price on Amazon
  • DOOOB twenty-four pack of cat fountain carbon and sponge filters

    DOOOB 5006-1, 24 pack

    A 24-piece filter and sponge set for stainless steel fountains, with the shortest change interval on this shelf and no published dimensions.

    Pieces
    24, carbon filters and sponge filters
    Price per filter
    $1.50 on a 12-and-12 split
    Stated fitment
    "Most stainless steel cat water fountains"
    Layers
    Non-woven, activated carbon, ion exchange resin
    Change interval
    Every 1 to 2 weeks
    Preparation
    Soak 5 minutes in a separate bowl, rinse 30 seconds
    Filter dimensions
    Not published
    Capacity
    Not published
    Amazon reference
    B0BQM9JH5B
    EAN
    6975681804480
    • The only set here that names a fountain material rather than a capacity
    • The soak instruction names a separate bowl, which keeps carbon dust out of the pump
    • No dimensions of any kind, so the compatibility it asks you to check cannot be checked on the page

    Best for: A stainless fountain whose filter size is already known from the old pack

    Check price on Amazon

All door tags & tunnels