The Tessi Window Restrictor Keyless is a versatile and secure solution for various window types, including wood, steel, aluminium, and UPVC. It comes with security screws and does not require a key, making it fire-safe. The product complies with the Product Safety Directive and the related standards EN16281:2013. To meet Irish Building Regulations, it's essential to stagger the receiver and base unit to ensure a maximum opening of 10mm when unlocked.