Alapine (frequency): IC 13.56MHz, ID 125KHz Sensing distance: 0~5cm Service life: can be repeatedly erased 100,000 times Pattern: more than 130 pattern choices, customizable patterns Whether with glue: double-sided tape (can also be sandwiched between mobile phone and mobile phone case) Mea Pono: plastic PVC + anti-interference material Packing: PP bag Specifications: diameter 38~42mm, thickness 0.70~1mm, can be customized