An NFC keyfob, short for Near Field Communication Keyfob, is a type of smart keyfob that incorporates NFC technology. It not only has the functions of a traditional keyfob, such as carrying keys and decoration, but also achieves various intelligent functions through the built-in NFC chip, including wireless data exchange, identity recognition, and access card simulation. This article will delve into the types, common parameters, functions, and application scenarios of NFC keyfobs.

NFC keyfobs can be divided into various types based on material, design, and functionality:
1. ABS material keyfobs: Made from ABS plastic, lightweight and durable, relatively low in price, suitable for everyday use.
2. Silicone material keyfobs: Soft and comfortable, with a good feel and certain elasticity, not easily damaged.
3. Metal material keyfobs: Stylish appearance, high-quality feel, but relatively expensive, suitable for users who pursue quality.
4. Epoxy resin material keyfobs: Waterproof and dustproof, with strong durability, suitable for outdoor or harsh environments.
In addition, NFC keyfobs can also be further classified based on chip types, such as NTAG 213 chip, NTAG 203 chip, etc., with different chips varying in storage capacity, security, and other aspects.

Some common parameters of NFC keyfobs include:

• Operating frequency: Typically 13.56MHz, which is the standard operating frequency for NFC technology.
• Storage capacity: The storage capacity of NFC keyfobs varies depending on the type of chip, with common storage capacities being 144 bytes, 504 bytes, osv.
• Communication distance: The communication distance of NFC technology is relatively short, generally within 10 centimetres, ensuring the security and reliability of data transmission.
• Operating temperature: NFC keyfobs usually operate normally within a certain temperature range, such as -20°C to 70°C.

The functions of NFC keyfobs are rich and varied, mainly including:

1. Access card emulation: Inputting access card information into the NFC keyfob to enable cardless entry.
2. Public transport card emulation: In some cities, public transport cards support NFC technology, allowing the card information to be input into the NFC keyfob for cardless travel.
3. Payment function: By linking a bank card or payment platform, it enables cashless and convenient payments.
4. Information transmission: Quickly transferring files, images, and other information with other NFC devices.
5. Identity verification: In situations requiring identity verification, such as company access control or gyms, the NFC keyfob can serve as proof of identity.

NFC keychain are used in a wide range of applications, covering many aspects of daily life:

1. Access control system: In companies, communities, schools and other places that need access control cards, NFC keychain can easily replace physical access control cards and realize contactless door opening.
2. Public transportation: Buses and subways in some cities support NFC technology, and the NFC keychain can be used as a bus card or subway card for convenient travel.
3. Payment scenario: Whether it is offline shopping or online payment, NFC keyfob can provide a convenient and secure payment method.
4. Information transmission: In the occasion that you need to quickly transfer documents, pictures and other information, such as conferences, exhibitions, etc., the NFC keychain can quickly transmit data with other NFC devices.
5. Identification: In occasions that require identity verification, such as gyms, libraries, etc., NFC keychains can be used as a credential for identity recognition to improve management efficiency.

In short, NFC keychain, as a fashionable, practical and intelligent keychain product, is gradually changing our lifestyle. With the continuous advancement of technology and the continuous expansion of application scenarios, NFC keychains are bound to play a more important role in the future.