{"product_id":"50pcs-rewritable-rfid-ibutton-key-fobs-access-control-rw1990","title":"50pcs Rewritable RW1990 RFID iButton Key Fobs – Access Control","description":"\n\u003ch2\u003e50-Pack Rewritable RFID iButton Key Fobs (RW1990) for Access Control\u003c\/h2\u003e\n\u003cp\u003eUpgrade your access control setup with this 50-pack of rewritable RFID iButton key fobs. Featuring the RW1990 chip with a unique 64-bit registration number, these fobs are fully compatible with DS1990A and TM1990A systems — making them ideal for hotel door locks, office security systems, sauna key access, smart communities, fire alarm controls, swimming pools, water patrol, and field work in high-humidity environments. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRewritable \u0026amp; Clonable:\u003c\/strong\u003e Easily copy or change codes using compatible read-write hardware — no need to reprogram your entire system.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnique 64-Bit Registration Number:\u003c\/strong\u003e Every fob carries a distinct identifier for reliable, conflict-free access management.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Compatible with DS1990A and TM1990A iButton systems; suits hotel, office, sauna, and other access control applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e ABS plastic holder with a 304 stainless steel iButton disc — built to withstand daily use and extreme temperatures (-40°C to +85°C).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5 Available Colors:\u003c\/strong\u003e Choose from Red, Yellow, Blue, Black, and Green — select all one color or a custom mix (simply leave a message at checkout).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Read-Write Method:\u003c\/strong\u003e Simple, reliable contact-based communication for fast identification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMemory:\u003c\/strong\u003e 64-bit (8Kbits chip capacity)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e φ16.25mm × 5.89mm (button); fob dimensions 55 × 20 × 7mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency:\u003c\/strong\u003e 860–960 MHz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e RW1990 (RW1990A-F5)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eColor Selection\u003c\/h3\u003e\n\u003cp\u003eYou may request a single color (e.g., \"Please send all black\") or a custom mix (e.g., \"10 blue, 15 black, 10 red, 10 green, 5 yellow\") in the order notes. If no color preference is specified, fobs will be sent according to the default color of your order variant.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNote: Due to lighting conditions during photography, slight color variation between images and actual product may occur.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications at a Glance\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;\"\u003e\n  \u003ctr style=\"background:#f7f7f7;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eChip Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eRW1990\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eChip Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e8Kbits (64-bit ID)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f7f7f7;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eFrequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e860–960 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eABS Holder + 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f7f7f7;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eRead-Write Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eContact\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eWorking Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f7f7f7;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eFob Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e55 × 20 × 7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eColors Available\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eRed, Yellow, Blue, Black, Green\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f7f7f7;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e50 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eHotel door lock systems\u003c\/li\u003e\n  \u003cli\u003eOffice access control\u003c\/li\u003e\n  \u003cli\u003eSauna \u0026amp; locker key cards\u003c\/li\u003e\n  \u003cli\u003eSmart community entry systems\u003c\/li\u003e\n  \u003cli\u003eFire alarm control panels\u003c\/li\u003e\n  \u003cli\u003eSwimming pool \u0026amp; aquatic facility access\u003c\/li\u003e\n  \u003cli\u003eWater patrol \u0026amp; field operations in humid environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on electronic access control security standards, visit the U.S. Consumer Product Safety Commission (CPSC).\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Are these RW1990 iButton key fobs compatible with DS1990A access control systems?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. These rewritable RW1990 iButton key fobs are fully compatible with DS1990A and TM1990A iButton systems. They feature a unique 64-bit registration number and can be used as direct replacements or cloned copies in most hotel, office, and security access control readers that support the DS1990A standard.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I change or reprogram the code on these key fobs?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. These fobs use the RW1990 chip, which supports rewriting and code-change functionality. With a compatible iButton read-write device or duplicator, you can copy an existing code or assign a new one. This makes managing access for hotels, offices, and facilities much more flexible and cost-effective.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I choose specific colors for my order of 50 fobs?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! Five colors are available — Red, Yellow, Blue, Black, and Green. Simply leave a message at checkout specifying your preferred color or a custom mix (e.g., \"10 blue, 15 black, 10 red, 10 green, 5 yellow\"). If no preference is noted, fobs will be dispatched per the default color for your order.\u003c\/p\u003e\n\u003ch4\u003eQ: What material are the iButton fobs made from, and are they durable?\u003c\/h4\u003e\n\u003cp\u003eA: Each key fob features a sturdy ABS plastic holder with a 304 stainless steel iButton disc. The working temperature range of -40°C to +85°C makes them suitable for use in demanding environments, including humid outdoor and aquatic settings.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are these RW1990 iButton key fobs compatible with DS1990A access control systems?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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