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1. 2 types: rewritable type, can read and rewrite, T5577 chip compatible with EM4305 chip. Static type - can not be changed after writing, compatible with TK4100 EM4100 chip. 2. Support read frequency: compatible with 125 kHz RFID reader to get access. 3. Wide application: can be used for elevator card, access control system, parking card, proximity. 4. Advanced days: no external power supply required. 5. After sale guarantee: we take care of the feeling of every customer. If this product does not meet or exceed your expectations, please contact us first, we will solve the problem immediately.