1、Powerful inner core, 125K low frequency chip, read/write/copy/over ID firewall. 2、Sensitive induction, induction distance between 2‑10cm (depending on the card reader). 3、Small and easy to carry, waterproof and fall resistant, can deal with a variety of environments. 4、Suitable for access control, hotel door locks, employee attendance, identification and security systems. 5、Campus entrance guard payment control, parking lot entrance guard payment, social security management, transportation payment, municipal and auxiliary service payment, etc. 50 x ID Card Keyfob Item Type: ID Card KeyfobMaterial: ABSUses: Access control, attendance, elevator, parking lotInduction Distance: Approx. 2-10cm/ 0.8- 3.9in (depending on the card reader)Working Frequency: 125KHZWorking Temperature: -40-55℃