Salto Metal Keyfob. NXP MIFARE DESFire 4K. Multi-colour 5-pack. For use with Salto SPACE & Homelok. Programmable as User or Guest fob allowing 2 way data transfer. Will transport blacklisted user details and audit trails. Re-programmable. Extremely resistant & suitable for most kinds of environments. Blue, Red, White, Black, Green plastic/metal disc suitable for keyring attachment.