The TK4100 contactless smart chip cards SMC4100 IC based on a roller connected with a few laps, which are then embedded in plastic. No batteries required. This map is read-only, 40-bit unique number in the Manchester code.
TK4100 is compatible EM4100. These cards are primarily used in access control applications and other identity authentication.

Being developed based on NXP RFID technology, D-Think 501A. It supports ISO14443A protocol. Free SDK is provided when customer orders D-Think 501 family desktop reader/writer, which helps an engineer to programme its own applications. The package is composed of PC_DEMO software, WinAPI and prototype description, USB driver, sample source code in C#, VC, BC, VB, PB and DELPHI.