RFID Key Fobs Explained 

Radio-frequency identification (RFID) key fobs are a single part of an RFID system. There are 2 parts: (1) the RFID key tag (commonly known as a key fob) and (2) the RFID reader. The RFID key fob also has two components: (1) a microchip that stores the data such as the unique ID and (2) An antenna which is usually a coiled wire to receive and transmit data.

These RFID Key Fobs are categorized by the frequency band in which it operates. Low, High or Ultra-high frequency. However, there are two major categories of RFID systems – Active and Passive, and we are explaining each of their types and frequencies below. 

Common Key Fobs

The common key fobs that are primarily used to access the amenities (swimming pools, gyms and elevators) of condos, HOA community villages, apartment complexes, and community centers are typically passive and low frequency (125 khz) RFID systems.

If the key fob only opens the front door of the apartment into the living space then it is a High frequency key fob.

If the key fob opens gates, doors into amenities and as well as the front door into the apartment living space then it is a dual frequency (both high and low frequency).

Low Frequency: Apartment Complexes, amenity gates, elevators, buildings, pools and gyms
High Frequency:
The actual apartment unit door into living space.
Dual Frequency: 
All of the above

Refer to our compatibility page for pictures. If you do not see your key fob there. Email us a picture of it to sales@sumokey.com and we will let you know if it is compatible. 

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Passive RFID tags

Passive RFID tags can be as small as 0.3mm and do not require batteries. Rather, they are powered by the radio signal of a RFID reader, which "wakes them up" to request a reply. Passive RFID tags can be read from a distance of about 20 feet. Semi-passive RFID tags contain a small battery that boosts the range. Passive tags are generally read-only, meaning the data they contain cannot be altered or written over.

Active RFID tags

Active RFID tags, also called transponders because they contain a transmitter that is always "on", are powered by a battery, about the size of a coin, and are designed for communications up to 100 feet from the RFID reader. They are larger and more expensive than passive RFID tags, but can hold more data about the product and are commonly used for high-value asset tracking. Active RFID tags may be read-write, meaning data they contain can be written over.


The LF band covers frequencies from 30 KHz to 300 KHz. Typically LF RFID systems operate at 125 KHz, although there are some that operate at 134 KHz. This frequency band provides a short read range of 10 cm, and has slower read speed than the higher frequencies, but is not very sensitive to radio wave interference.


The HF band ranges from 3 to 30 MHz. Most HF RFID systems work at 13.56 MHz with read ranges between 10 cm and 1 m. HF RFID is ordinarily utilized for ticketing, installment, and information exchange applications.


The UHF recurrence band covers the reach from 300 MHz to 3 GHz. Systems consenting to the UHF Gen2 standard for RFID utilize the 860 to 960 MHz band. While there is some fluctuation in recurrence from area to locale, UHF Gen2 RFID systems in many nations work somewhere around 900 and 915 MHz.The read scope of detached UHF systems can be the length of 12 m, and UHF RFID has a speedier information exchange rate than LF or HF. UHF RFID is the most touchy to impedance, however numerous UHF item producers have discovered methods for planning labels, antennas, and readers to keep execution high even in troublesome situations. Inactive UHF labels are simpler and less expensive to make than LF and HF labels.UHF RFID is utilized as a part of a wide assortment of applications, extending from retail stock administration, to pharmaceutical hostile to forging, to wireless device design. The heft of new RFID tasks are utilizing UHF contradicted to LF or HF, making UHF the quickest developing section of the RFID market.To get started with our key fob copy or clone services check out our homepage. Check out our services page to see a list of RFID key fob duplication services.