RFID keyfobs are access control tokens that contain RFID chips. RFID keyfobs are used for contactless identification or to enable access to buildings and secure areas. They contain unique ID codes in RFID tags that can be read by RFID readers to identify the keyfob holder and grant or deny access. RFID keyfobs are a popular method for access control in offices, gyms, apartments, parking garages, etc. They are reusable and programmable, you can reprogram the RFID tags with new access codes or access privileges as needed.

Parameters of Contact/Contactless chip

Chip model	Brand	Type	Frequency	Memory	Read-Write time	Data conservation	Protocal
Mifare S50	NXP	Contactless	13.56Mhz	1Kbyte	100000	10 years	ISO 14443A
Mifare S70	NXP	Contactless	13.56Mhz	4Kbyte	100000	10 years	ISO 14443A
Mifare desfire 2k	NXP	Contactless	13.56Mhz	2Kbyte	500000	10 years	ISO 14443A
Mifare desfire 4k	NXP	Contactless	13.56Mhz	4Kbyte	500000	10 years	ISO 14443A
Mifare desfire 8k	NXP	Contactless	13.56Mhz	8Kbyte	500000	10 years	ISO 14443A
Mifare ultralight	NXP	Contactless	13.56Mhz	64byte	100000	5 years	ISO 14443A
Mifare PLUSS2K/X2K	NXP	Contactless	13.56Mhz	2byte	200000	10 years	ISO 14443A
M1 PLUSS2K/4K	NXP	Contactless	13.56Mhz	4byte	200000	10 years	ISO 14443A
I-CODE SLI	NXP	Contactless	13.56Mhz	1024bits	100000	40 years	ISO15693
HITAG1	NXP	Contactless	125KHZ	2048bits	100000	10 years	ISO11784/785
HITAG2	NXP	Contactless	125KHZ	256bits	100000	10 years	ISO11784/785
HITAG3	NXP	Contactless	125KHZ	256/2048bits	100000	10 years	ISO11784/785
FM11RF08	FUDAN	Contactless	13.56Mhz	1Kbyte	100000	10 years	ISO14443A
FM11RF32	FUDAN	Contactless	13.56Mhz	4Kbyte	100000	10 years	ISO14443A
FM1208 series	FUDAN	Contactless	13.56Mhz	8Kbyte	100000	10 years	ISO14443A
FM1204	FUDAN	Contactless	13.56Mhz	4Kbyte	100000	10 years	ISO14443A
Legic256	Legic	Contactless	13.56Mhz	256byte	100000	10 years
Ti2048	TI	Contactless	13.56Mhz	256byte	100000	10 years	ISO15693
ID4001/4100	RUIXIN	Contactless	125KHZ	–	100000	10 years	–
EM4200/4305	EM	Contactless	125KHZ	–	100000	10 years	–
T5577	ATMEL	Contactless	125KHZ	330bits	100000	10 years	ISO1178/785
U-CODE HSL	HSL	Contactless	915KHZ	2048bits	100000	10 years	ISO18000-6B
Alien9662(H3)	ATMEL	Contactless	915KHZ	96bit EPC/512Bit usermemory	100000	10 years	ISO18000-6C
Fm1216 series	FUDAN	Contactless	13.56Mhz	16Kbyte	100000	10 years	ISO14443A
SLE4442/5542	SIEMENS	Contact	–	256byte	100000	10 years	ISO7816
SLE4428/5528	SIEMENS	Contact	–	1byte	100000	10 years	ISO7816
45DB041	ATMEL	Contact	–	528Kbyte	100000	10 years	ISO7816
AT88SC102	ATMEL	Contact	–	1024bits	100000	10 years	ISO7816
AT88SC1604	ATMEL	Contact	–	5704bits	100000	10 years	ISO7816
AT88SC153	ATMEL	Contact	–	2048bits	100000	10 years	ISO7816
24 series		Contact	–	1k-64kbits	100000	10 years	ISO7816