The ultimate disc lock: The top-of-the-line mega-strong XN18 features an 18 mm high-security four-way locking pin, reinforced carbide substructure and a fortified key barrel with carbide underpinning. Mono-block construction body and locking pin are made entirely of the finest grade high nickel-content stainless steel.
Alarm: Shock and motion sensors trigger a 110 dB alarm. The unit is self-arming, with no on-off switch, and re-sets to armed mode within 15 seconds if the disturbance stops. Unique features include a Blue LED indicator light to warn that the XN18 is armed and means business.
Note: The XN18 User Manual can be found here.