factory with over 1,500 employees 12 years RFID experience fine quality with competitive price various chips are available Hitag2 ABS RFID key fob for attendance management SpecificationsMaterial: ABSOperational Frequency: LF 125 KHz/HF 13.56MHzAvailable Chip:125KHz chips:EM4100, EM4102, EM4450, TK4100, T5567, Hitag1, Hitag2, HitagS13.56MHz chips:NXP Mifare1 S50, Mifare1 S70, Mifare Ultralight10, ...