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 TI-ID card or EM-ID card
4, Long lifetime: >20 years
5, High sensitive and Long inductive distance
6, Wide temperature scope: -40+85 or -40+70
7, Not need power supply
8, Dimension: φ85mm, Thickness: 10mm
9, Weight: 50g
10, Original USA material, warranty: 5 years.