{"product_id":"rosslare-access-control-key-fob-em4102-25-pack","title":"Rosslare Access Control Key Fob - 125 kHz EM4102 Proximity Fob, Pack of 25 (AT-ERK-26A7TB0)","description":"\u003ch2 style=\"text-align: center;\"\u003e\u003cstrong\u003eRosslare Access Control Key Fob - 125 kHz Proximity Fob, 25-Pack\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003ca href=\"\/collections\/rosslareaccesscontrol\"\u003eRosslare\u003c\/a\u003e AT-ERK-26A7TB0 is a 125 kHz proximity key fob for access control systems, sold in packs of 25 to outfit an entire office, building, or membership roster from a single order. A fob is a contactless credential that holds a unique ID: the user taps it to a 125 kHz reader at a door, the reader sends the ID to the controller, and the controller unlocks the door if the ID is authorized.\u003c\/p\u003e\n\u003cp\u003eInside each fob is an EM4102 (or GK4001) read-only chip paired with a copper coil antenna, which is the standard 125 kHz proximity technology used in most access control deployments and by readers from Rosslare, HID, ZKTeco, and other major brands. These fobs directly replace the older Rosslare AT-R271BL, so existing 125 kHz systems can roll them in without reprogramming the reader.\u003c\/p\u003e\n\u003cp\u003eEach fob in this pack is factory-encoded with a unique ID, ready to enroll in the controller. Contactless and passive, they never need batteries and draw power from the reader field when held within 20 cm of the antenna. As part of the broader \u003ca href=\"\/collections\/security-surveillance\"\u003esecurity and surveillance\u003c\/a\u003e product line at Island Electrical Supply, this pack is a stock item for integrators provisioning new tenants or replacing lost credentials.\u003c\/p\u003e\n\u003ch3\u003eWho This Key Fob Pack Is For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProperty managers and HOA administrators\u003c\/strong\u003e issuing or replacing credentials for residents, amenity access, gym entry, or parking gates on a 125 kHz reader system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecurity integrators and locksmiths\u003c\/strong\u003e specifying credentials for commercial tenant fit-outs, small office builds, or migration off legacy systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFacility managers at offices, schools, gyms, and warehouses\u003c\/strong\u003e who need a cost-effective 25-pack to enroll new employees, members, or contractors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGood to Know Before You Buy\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 125 kHz EM4102:\u003c\/strong\u003e Works with any reader that supports EM4102 or GK4001 at 100-150 kHz. That covers the majority of Rosslare, ZKTeco, HID ProxPoint Plus, and generic 125 kHz prox readers in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-in replacement for AT-R271BL:\u003c\/strong\u003e These fobs use the same format and read protocol as Rosslare's previous generation, so existing controllers and readers accept them without firmware changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContactless and batteryless:\u003c\/strong\u003e Passive RF technology means no batteries to replace and no charging. Fobs last for the life of the credential as long as the PVC shell stays intact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRead range up to 20 cm:\u003c\/strong\u003e Actual distance depends on the reader's antenna and orientation. Most door readers get a reliable tap at 2 to 10 cm, which is what access control deployments typically target to avoid accidental reads from pocket fobs walking past.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTough PVC build:\u003c\/strong\u003e Rated -20°C to 50°C (-4°F to 122°F) operating range and 90% non-condensing humidity. The sealed shell handles pockets, keychains, and daily office wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuild and Compatibility\u003c\/h3\u003e\n\u003cp\u003eDurable PVC shell in Rosslare's black \"cool twist\" shape with a keyring slot. Copper coil antenna paired with an EM4102 or GK4001 read-only IC. Operating frequency 100-150 kHz (125 kHz nominal), read distance up to 20 cm depending on antenna geometry. Contactless passive operation with no battery required. Operating and storage temperature -20°C to 50°C (-4°F to 122°F), humidity 90% non-condensing. Factory-encoded with a unique ID per fob. Ships as a 25-piece pack. Direct replacement for Rosslare AT-R271BL.\u003c\/p\u003e","brand":"Rosslare","offers":[{"title":"Default Title","offer_id":52318392320184,"sku":"AT-ERK-26A7TB0","price":58.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/9110\/4952\/files\/ScreenShot2025-11-24at11.30.07PM.png?v=1764045012","url":"https:\/\/islandelectricalsupply.com\/products\/rosslare-access-control-key-fob-em4102-25-pack","provider":"Island Electrical Supply","version":"1.0","type":"link"}