Paradox C704 Fobs: Identification and Replacement Checks
The Paradox C704 is a passive proximity key tag. For a replacement, confirm the installed reader and the administrator’s enrollment requirements before ordering. The name of an alarm panel or the color of a fob is not enough to establish compatibility.
American Key Cards is independent and is not affiliated with or endorsed by Paradox. This article is an identification guide, not a promise that any generic fob will replace a C704 in every installation.
Identify the product you have
Paradox’s readers and cards documentation identifies the C704, formerly CR-R704-B, as a blue proximity tag that needs no battery. The same page separately describes the C702 clamshell card, C706 printable card, R910 reader and RAC1 remote control with an integrated access card.
Those are different products. A remote’s alarm-control functions and a tag’s presentation to a proximity reader are not interchangeable simply because both are associated with a Paradox installation. Likewise, the panel model alone does not identify the reader installed at a door.
Start with the complete credential part number on the original packaging or invoice. If the label is missing, have the site’s installer inspect the reader information. A blue plastic shell is only a visual clue; many unrelated tags use similar housings.
Information to gather before a quote
| Detail | Where to look |
|---|---|
| Complete original credential reference | Previous order, packaging or installer records. |
| Door-reader model | Approved installation record or equipment label checked by the installer. |
| Panel and any access module | System documentation, so the installer can verify the full combination. |
| Credential enrollment method | Site administrator or the manual for the installed access system. |
| Authorized replacement or new-user allocation | The administrator responsible for maintaining user access. |
Do not infer a universal 24-bit or 26-bit specification from the C704 model name. The manufacturer product summary establishes the product identity; it is not a complete encoding and commissioning specification for every connected installation.
When evaluating an alternative
Ask a supplier to identify the exact reader configuration for which its proposed credential has been tested. Confirm the radio technology, encoding and enrollment requirements with the installer. Matching a frequency or a printed identifier does not by itself prove that the replacement is suitable.
Approve a small authorized sample before buying a larger quantity. During that check, the administrator should confirm that the expected user identity is recognized and that access is limited to the intended doors and times. If the proposed tag requires an unexplained change to system settings, stop the order review and have the installer resolve the mismatch.
For a lost tag
Ask the administrator to disable the missing credential and issue its replacement under the site’s policy. A replacement tag does not automatically remove the lost tag from the access system. If you are a resident or employee rather than the administrator, the building’s normal replacement process is the correct starting point.
If the original specification cannot be verified, use the Paradox installer or approved supply channel for a replacement. Bring the available equipment and order records so the installer can confirm the credential type.
