General
Frequency	125 kHz
Chip standard	EM4102
Memory size	64 Bit
Technology	Low Frequency
Writability	rewritable
Shape	drop shape
Thickness	6,0 mm

The Transponder Key Fob from Promag, type GiTAG1Q-20K, is a Low-Frequency transponder for use in access control systems and identification systems. It operates in the frequency range of 125 kHz and is based on the chip standard EM4102. The fob features a 64-bit memory that is rewritable, making it suitable for applications where data needs to be changed or updated over time. The shape of the fob is teardrop-shaped, with dimensions of 40 mm × 30 mm and a thickness of 6.0 mm, enabling a compact and convenient design.

Transponder key fobs are specifically designed for integration into key fobs or similar wearable items to enable simple and mobile identification. They are used in areas where contactless authentication is required, such as in office buildings, factories, hotels, or for access control to server rooms. The Low-Frequency technology (125 kHz) provides sufficient range for most access systems and is particularly robust against electromagnetic interference. The EM4102 chip is a widely used standard in the RFID industry and supports the storage of identification data that can be read by a reader device.

Functions and features in detail include a 64-bit memory sufficient for storing a unique ID number. The rewritable capability allows the memory content to be changed, for example, when access rights are modified or when a user is reassigned. The teardrop shape of the fob ensures ergonomic handling and prevents snagging when attaching to a key ring or bag strap. The dimensions of 40 mm × 30 mm and 6.0 mm thickness are compatible with most standard key fob holders.

Technology explained simply means that the fob does not require an internal power supply but is powered by the electromagnetic energy from the reader device. This principle is known as a passive RFID transponder. The frequency of 125 kHz falls within the Low-Frequency transponder range, which means a short range (typically a few centimeters) and high reliability near metallic surfaces or in environments with electromagnetic interference. The EM4102 chip is a contactless memory chip that does not offer additional functions such as encryption or authentication, but primarily serves for identification purposes.

Compatibility and accessories refer to systems that support the EM4102 chip. This includes many common access control systems designed for 125 kHz transponders. The fob can be used with standard transponder readers designed for the 125 kHz frequency.

Mounting and installation typically involve simply attaching the fob to a key ring or a lanyard. No special tools or installation procedures are required. The fob is hung directly onto the carrier object and is immediately ready for use. Operation is contactless: the fob is held near the reader device, which then reads the stored ID number.

Operational advantages include easy handling, robust construction, and rewritability. The teardrop shape ensures secure attachment and prevents loss. The Low-Frequency technology offers high reliability in various environments, especially in areas with metallic surfaces. The rewritability allows for flexible use without needing to purchase new fobs when access rights change.

Batteries are not included in the delivery scope.