HID 1346 ProxKey III 125 kHz Proximity Keyfob (26-Bit H10301) — Chicago Commercial Credential

HID 1346 ProxKey III 125 kHz Proximity Keyfob (26-Bit H10301)

The HID 1346 ProxKey III is the legacy-standard 125 kHz proximity keyfob from HID Global — the credential most-installed at Chicago commercial properties before the migration to 13.56 MHz smart cards. Built into a durable ABS keyfob shell that easily attaches to a key ring, badge clip, or lanyard, the ProxKey III is battery-free (no battery means an infinite number of reads over the credential’s lifetime), and it programs with the 26-bit H10301 format — the most common 125 kHz proximity format and an open format, meaning HID and competing manufacturers can both encode credentials compatible with most Wiegand-26 readers.

What’s Confirmed by the Official HID Spec

These specifications come directly from HID Global’s published product page for the 1346 ProxKey III:

• Frequency: 125 kHz proximity
• Format: 26-bit H10301 (HID’s standard open 125 kHz proximity format)
• Facility Code Range: 0–255
• Number Range: 0–65,535
• Construction: Durable ABS, key-ring compatible
• Battery: None — infinite number of reads
• Designed: To withstand harsh operating environments and handling
• Compatible products (per HID): Schlage 7610, Identiv 4080 / 4082, and most other Wiegand-26 access control readers and panels

Why 125 kHz Prox Is Still Specified in 2026

For new commercial installations, modern smart-card credentials (HID iCLASS 2050, HID Seos 5266, Schlage MIFARE) are the preferred choice — encrypted authentication, higher security, and migration-ready ecosystems. But there are real situations where the ProxKey III remains the right pick:

• Installed-base maintenance — properties already running 125 kHz HID Prox systems where the existing readers, panels, and credential database are committed to 26-bit H10301 for years to come
• Multi-tenant residential portfolios with legacy Prox card / fob populations across many buildings — replacing fobs (rather than the entire system) keeps the existing infrastructure working
• Multi-technology readers like the HID multiCLASS SE RP40 read both 125 kHz Prox AND 13.56 MHz smart cards simultaneously — properties undergoing a phased migration issue ProxKey III credentials to legacy users while new staff get smart credentials
• Budget-conscious deployments where the lower per-fob cost of 125 kHz Prox is meaningful relative to the security threat model of the property

Where the HID 1346 ProxKey III Wins in Chicago

• Chicago commercial offices on installed-base 125 kHz HID Prox systems
• Multi-tenant residential properties with legacy HID Prox card / fob populations
• Property management portfolios standardizing on 26-bit H10301 across multiple buildings
• Industrial / warehouse personnel-door access on existing Prox systems
• Education facility staff and student keyfob credentials on legacy Prox
• Healthcare clinic staff fobs on existing Prox readers
• Hospitality back-of-house keyfob access
• Government / municipal facility legacy-Prox replacement keyfobs
• Retail back-of-house manager and stockroom keyfobs
• HOA building entries with budget-conscious legacy-Prox credential populations

Local Chicago Coverage

Vidimost installs and supplies the HID 1346 ProxKey III across the full Chicago metropolitan area for legacy-Prox installed-base maintenance and budget-conscious 125 kHz keyfob deployments.

Recommended Pairings

• HID iCLASS 2050 Keyfob — 13.56 MHz smart-card alternative for properties migrating off 125 kHz Prox
• HID Seos 5266 Keyfob — high-security 13.56 MHz smart-card credential
• HID multiCLASS SE RP40 — multi-tech reader supporting both 125 kHz Prox AND 13.56 MHz simultaneously (standard upgrade path for phased migrations)
• HID ProxPoint Plus 6005 — basic 125 kHz Prox reader for ProxKey III credentials
• HID ProxPro 5355 — outdoor 125 kHz Prox reader

Professional Installation by Vidimost

Vidimost LLC supplies and installs HID 1346 ProxKey III credentials across Chicago for installed-base 125 kHz Prox systems. Full-scope service includes site walkthrough, facility-code and number-range coordination with the existing access platform, credential programming (or coordination with the manufacturer’s pre-encoded program), and deployment to authorized users. Contact us for a free site walkthrough and quote.