The XS4 GEO mortise cylinder is specially designed to fit most doors that are equipped with a mortise lock that need a mortise cylinder. SALTO SVN and SALTO Wireless network capable. All communication between the carrier and the electronic cylinder is encrypted and secured. Optical signalling through light ring. Dual color green/red to indicate access authorization. Acoustic signal optional. The batteries can be replaced without cylinder removal. Equipped with anti-drilling protection.