50pcs Rewritable RW1990 RFID iButton Key Fobs – Access Control

50-Pack Rewritable RFID iButton Key Fobs (RW1990) for Access Control

Upgrade 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.

Key Features

• Rewritable & Clonable: Easily copy or change codes using compatible read-write hardware — no need to reprogram your entire system.
• Unique 64-Bit Registration Number: Every fob carries a distinct identifier for reliable, conflict-free access management.
• Wide Compatibility: Compatible with DS1990A and TM1990A iButton systems; suits hotel, office, sauna, and other access control applications.
• Durable Construction: ABS plastic holder with a 304 stainless steel iButton disc — built to withstand daily use and extreme temperatures (-40°C to +85°C).
• 5 Available Colors: Choose from Red, Yellow, Blue, Black, and Green — select all one color or a custom mix (simply leave a message at checkout).
• Contact Read-Write Method: Simple, reliable contact-based communication for fast identification.
• Memory: 64-bit (8Kbits chip capacity)
• Size: φ16.25mm × 5.89mm (button); fob dimensions 55 × 20 × 7mm
• Frequency: 860–960 MHz
• Model: RW1990 (RW1990A-F5)

Color Selection

You 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.

Note: Due to lighting conditions during photography, slight color variation between images and actual product may occur.

Specifications at a Glance

Typical Applications

• Hotel door lock systems
• Office access control
• Sauna & locker key cards
• Smart community entry systems
• Fire alarm control panels
• Swimming pool & aquatic facility access
• Water patrol & field operations in humid environments

For more information on electronic access control security standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: Are these RW1990 iButton key fobs compatible with DS1990A access control systems?

A: 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.

Q: Can I change or reprogram the code on these key fobs?

A: 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.

Q: Can I choose specific colors for my order of 50 fobs?

A: 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.

Q: What material are the iButton fobs made from, and are they durable?

A: 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.