Plastic 125khz passive Rewritable RFID EM4450 Contactless card

• This low frequency (LF) passive clamshell RFID card EM 4450 is waterproof and wallet sized. It provides a tested read range up to 130 cm (50 in.) and has a slot to attach a lanyard. Its tested read range is up to 130 cm (50 in.). The RFID card offers true anti-collision properties for multiple tag detection. It is commonly utilized in ticketing, high security hands free, industrial or manufacturing automation, and prepayment devices.
• Plastic 125khz  passive Rewritable RFID EM4450 Contactless card

• Type	RFID EM4450 Contactless card
  Operating frequency	125 ± 6 kHz
  Capacity	64 bits
  Data coding type	Manchester
  Tested read range	Up to 130cm (50in.) depending on RFID reader and data coding type
  Multi-detection	Yes
  Read quantity (max.)	Determined by mode tags/sec
  Material	ABS , PVC or PET
  Color	White – can be silk screened or offset printed on PVC side
  Compliance	IC EM4450
  Operating specifications	Waterproof
  	Resisting to immersion in salt water, alcohol, oil, 10% HCL, ammonia and avoiding shock and vibration
  Storage temperature	-55 °C to 100 °C
  Operating temperature	-40 °C to 85 °C
  Dimension	85.6 mm × 53.98 mm × 1.8 mm
  Weight	9 g ± 0.5 g

The EM4450 is a CMOS integrated circuit intended for use in electronic Read/Write RF Transponders. The chip contains 1 Kbits of 

EEPROM which can be configured by the user, allowing a write inhibited area, a read protected area, and a read area output continuously at power on.