The EM4200 card is a CMOS integrated circuit for use in electronic Read Only RF Transponders. The circuit is powered by an external coil placed in an electromagnetic field, and gets its master clock from the same field via one of the coil terminals. By turning on and off the modulation current, the chip will send back the 64 bits of information contained in a factor preprogrammed memory array.

Tk4100 Clamshell cards remain popular and Tatwah Smartech offers Versions inboth ABS or Polycarbonate with each having a printable PVC cover sheet. Tatwah's laminated product portfolio includes sizes or even shapes which differ from the ISO format.

125Khz Clamshell cards are mainly used in attendance system, access control system, one-card system of enterprise, animal identification, identity recognition, automatic industry, conference attendance, electronic tag, supermarket, warehouse management, staff management, security system, medical institution, etc.

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