How the compatible EU intercom fobs - Comelit / Urmet / Videx (LF variants) works
The EU intercom fobs - Comelit / Urmet / Videx (LF variants) is a dual-frequency credential operating on both 125 kHz LF and 13.56 MHz HF, so the compatible part must carry the correct data on whichever band your readers use. Its data structure is EM4100 / Mifare-UID / proprietary 26-bit per brand (Urmet/FDI 26-bit; Comelit SimpleKey = MIFARE Classic CSN). When you present a credential, the reader decodes that exact structure and passes it to your access-control panel as a card number it recognises.
We build the compatible EU intercom fobs - Comelit / Urmet / Videx (LF variants) by encoding the identical data structure onto a programmable T5577 / EM4305 chip. Once written, the reader cannot tell the difference between our credential and the original — it presents the same bits, the same facility code, and the same card number. That is what "compatible by specification" means: not a generic look-alike, but a credential engineered to read exactly as the original does, matched to your facility code and card-number range.
The Comelit format sits among the specialist proximity credentials most card vendors never tooled up to produce — which is why the only other source is usually the original manufacturer, at a steep premium. Supporting these hard-to-find formats is exactly what Security ID Systems specialises in. Tell us the format printed on your card, or send a sample for us to read, and we confirm compatibility before you order.
Also known as
Comelit · Comelit SimpleKey · SK9050 · Urmet fob · Videx fob · intercom fob · EU door entry fob · Urmet 1125/50
Comelit and all other brand and product names are trademarks of their respective owners. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, sponsored by, or endorsed by these companies. Brand and format names are used only to identify the systems our products are compatible with. MIFARE and DESFire are registered trademarks of NXP B.V.