- Frequency: EM proximity devices operate on a low-frequency radio band of 125 kHz.
- Contactless: Cards, key fobs, or wristbands do not require physical contact or line-of-sight. When waved near an EM Proximity Reader, the card extracts power from the reader’s electromagnetic field and transmits its programmed ID number in binary form.
- Validation: The reader transmits this ID to a centralized access system. If the ID is recognized and approved, the door or gate is unlocked.
- Passive Design: EM Prox cards and tags require no batteries or maintenance.
- Common Hardware: The underlying EM protocol (such as the EM4100/EM4102 chipsets) is widely compatible across many security brands.
- Security Limitations: Because the ID number is transmitted “in the clear” without complex encryption, traditional 125-kHz proximity systems are susceptible to eavesdropping or cloning by unauthorized devices. As a result, many modern systems pair it with secure biometrics or upgrade to Bluetooth/Smart card alternatives.
- Office building entry and elevators.
- Employee time and attendance tracking.
- Residential complex gates and parking barriers.
- Vandal-resistant standalone keypads and door controllers.
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Access ControlHID 40KNKS-00-000000
Read moreHID Global 40KNKS-00-000000 Signo Access Control Keypad Multi-Tech Standard-Profile (SEOS / iClASS SE / iClASS SR / iClASS / MIfae Desfire EV1/EV2 (SIO) / Mifare Classic / HID Prox / Indala / EM Prox) Reader – (IP65-Rated) Weatherproof & Tamper-proof – Black Bezel – Integred Keypad – Secure Mobile ID via NFC / Bluetooth – Supports OSDP (Open Supervised Device Protocol)
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Access ControlHID 40NKS-00-000000
Read moreHID Global 40NKS-00-000000 Signo Access Control Multi-Tech Standard-Profile (SEOS / iClASS SE / iClASS SR / iClASS / MIfae Desfire EV1/EV2 (SIO) / Mifare Classic / HID Prox / Indala / EM Prox) Reader – (IP65-Rated) Weatherproof & Tamper-proof – Black Bezel – Secure Mobile ID via NFC / Bluetooth – Supports OSDP (Open Supervised Device Protocol)
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Access ControlHID 20KNKS-00-000000
Read moreHID Global 20KNKS-00-000000 Signo Access Control Keypad Multi-Tech Standard-Profile (SEOS / iClASS SE / iClASS SR / iClASS / MIfae Desfire EV1/EV2 (SIO) / Mifare Classic / HID Prox / Indala / EM Prox) Reader – (IP65-Rated) Weatherproof & Tamper-proof – Slimline – Mullion Style – Black Bezel – Integred Keypad – Secure Mobile ID via NFC / Bluetooth – Supports OSDP (Open Supervised Device Protocol)
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Access ControlHID 20NKS-00-000000
Read moreHID Global 20NKS-00-000000 Signo Access Control Multi-Tech Standard-Profile (SEOS / iClASS SE / iClASS SR / iClASS / MIfae Desfire EV1/EV2 (SIO) / Mifare Classic / HID Prox / Indala / EM Prox) Reader – (IP65-Rated) Weatherproof & Tamper-proof – Slimline – Mullion Style – Black Bezel – Secure Mobile ID via NFC / Bluetooth – Supports OSDP (Open Supervised Device Protocol)