1, It is plastic housing with a microchip inside containing a unique serial code which is then related to a check point

2, Anti-destroyed & Waterproof, anti-corrode, fit for every environment

3, Non-contact EM-ID card

4, Long lifetime: >20 years, can read >350,000 time

5, High sensitive and Long inductive distance

6, Wide temperature scope: -40+70

7, Not need power supply

8, Dimension: φ85mm, Thickness: 10mm

9, Weight: 50g

10, Original USA material, warranty: 5 years