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Specifications: Uses EM format RFID signal: 125Khz Non-contact reading Very durable (Over 20 years usage life) Completely waterproof, all-weather that can be used reliably in rainy, snowy, dusty, or other adverse environments Passive and no power required for operation Each card come with a unique ID number,but the ID number not print in the case Dimension: Diameter 40mm/1.57in Thickness: 4mm / 0.16in Readable distance: 0-60mm / 0-2.36in Material: ABS Applicable to patrol, trees, animals, access, public transportation, parking, identity authentication, attendance management, ticket, card payment, product identification, etc. Note: This EM/ID signal card/button shape are used together with our guard tour hand-held readers. They are completely waterproof. Can be operate in wide temperature ranges. Suitable for being mounted on wall and it is designed with backlight so easily be identified in poor light condition, those signal cards can be read without contact.They are the ideal replacement products for contact-based guard tour checkpoints. Package:50 x Tag