... environment,Long lifetime: >20 years. commodity:RFID tag for guard tour system1, It is plastic housing with a microchip ... code which is then related to a check point . 2, Anti-destroyed & Waterproof, anti-corrode, fit for every environment3, Non-contact EM ... , Dimension: φ85mm, Thickness: 10mm9, Weight: 50g10, Original USA material, warranty: 5 years.