Salto Proximity Contactless RW fob. 1 kbyte yellow fob for use with all Salto Proximity Contactless RW Locksets, E-cylinders and Wall readers. 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 plastic disc suitable for keyriing attachment.