RFID Key Fobs 125KHz 50 PCS T5577 Rewritable Pack - Bulk Access

In this review of the RFID Key Fobs 125KHz 50 PCS pack, the bottom line is straightforward: this set is aimed at installers, small businesses, and property managers who need a large quantity of reliable, rewritable proximity tags at an affordable unit cost. The reviewer found the biggest reason to buy is the combination of high quantity and the rewritable T5577 chip, which lets administrators reprogram tags for changing access lists without replacing hardware. It is a practical, no-frills choice when you need many fobs for doors, visitor badges, or temporary credentials.

Key Features

• High quantity availability: Fifty tags in one pack provide immediate coverage for multi-door systems, visitor programs, or rollout to staff without repeat orders.
• Rewritability: The T5577 chip can be programmed and erased repeatedly so access rights can be updated without buying new tags.
• 125KHz compatibility: These key fobs operate at a common low frequency that works with many existing RFID readers used in access control and door lock systems.
• Versatile applications: The fobs are suitable for homes, offices, schools, hotels, and other places where simple proximity access is required.
• Multiple colors available: Color options make it easy to assign and visually separate user groups, departments, or temporary credentials.

Who It's For

This pack is best for facility managers, security installers, or small and medium businesses that need to issue access credentials in bulk without a high per-unit price. The rewritable T5577 makes it useful where staff turnover or visitor access changes are frequent and tags must be recycled.

It is less suitable for projects requiring high-security, encrypted smartcards or NFC-based credentials used for payments or strong authentication. Buyers who need detailed manufacturer encryption or specific proprietary formats should check compatibility with their reader beforehand.

Pros & Cons

Pros

• Large pack size saves time and reduces cost per credential for multi-user deployments.
• Rewritable T5577 chip allows flexible management of access rights over time.
• 125KHz frequency ensures broad compatibility with many access control readers.
• Color choices simplify organization and identification of user groups.

Cons

• Not appropriate for systems requiring higher-security encrypted cards or modern NFC standards.
• Source documentation is focused on basics; integrators should verify reader compatibility before purchase.

Specifications

Quantity	50 pieces
Chip type	T5577 (rewritable)
Frequency	125KHz
Color	Multiple colors available
Primary use	Access control, door locks, visitor management

Our Verdict

For anyone who needs many prox credentials that can be reprogrammed, this 50-pack of 125KHz T5577 key fobs represents good value and straightforward utility. It is a sensible purchase for installers and facilities that rely on conventional RFID readers and want reusable, low-cost tags, but those needing high-security smartcard features should look at other options.

Frequently Asked Questions

Are these fobs writable and reusable?
Yes, they use the T5577 chip which is rewritable so data can be programmed and erased multiple times.

Will these work with my existing reader?
They operate at 125KHz and are compatible with many common readers at that frequency, but you should verify your reader accepts T5577-format tags.

What environments are they suited for?
They are intended for typical access control uses such as homes, offices, schools, hotels, and visitor management systems.